Adding Users (Friends) In Ribbit PLEASE HELP

            <p>
#import <UIKit/UIKit.h>
#import <Parse/Parse.h>

@interface EditFavoritesViewController : UITableViewController <UISearchBarDelegate>


@property (nonatomic, strong) NSArray *allUsers;
@property (nonatomic, strong) PFUser *currentUser;
@property (nonatomic, strong) NSMutableArray *friends;
@property (strong, nonatomic) IBOutlet UISearchBar *searchBar;

- (BOOL)isFriend:(PFUser *)user;

@end




#import "EditFavoritesViewController.h"
#import <Parse/Parse.h>


@interface EditFavoritesViewController ()

@end

@implementation EditFavoritesViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.searchBar.delegate = self;

    - (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar {

        //dismiss keyboard
        [self.searchBar resignFirstResponder];

    }

    - (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar {

        //Enable the cancel button when the user touches the search field
        self.searchBar.showsCancelButton = TRUE;
    }

    - (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar {

        //dsiable the cancel button when the user ends editing
        self.searchBar.showsCancelButton = FALSE;
    }

    - (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {

        //dismiss keyboard
        [self.searchBar resignFirstResponder];


        //Strip the whitespace off the end of the search text
        NSString *searchText = [self.searchBar.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];


        //Check to make sure the field isnt empty and Query parse for username in the text field
        if (![searchText isEqualToString:@""]) {

            PFQuery *query = [PFUser query];
            [query whereKey:@"username" equalTo:searchText];
            [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
                if (!error) {

                    //check to make sure the query actually found a user
                    if (objects.count > 0) {

                        //found a user
                        //set the user as the table views data source and reload the table view


                        //A user was not found, display error message
                    } else {

                        //no user found

                    }

                    [self.tableView reloadData];

                } else {

                    //error occurred
                }
            }];

        }


    }


    PFQuery *query = [PFUser query];
    [query orderByAscending:@"username"];
    [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
        if (error) {
            NSLog(@"Error: %@ %@", error, [error userInfo]);
        }
        else {
            self.allUsers = objects;
            [self.tableView reloadData];
        }
    }];

    self.currentUser = [PFUser currentUser];
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return [self.allUsers count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    PFUser *user = [self.allUsers objectAtIndex:indexPath.row];
    cell.textLabel.text = user.username;

    if ([self isFriend:user]) {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
    }
    else {
        cell.accessoryType = UITableViewCellAccessoryNone;
    }

    return cell;
}

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [self.tableView deselectRowAtIndexPath:indexPath animated:NO];

    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];

    PFRelation *friendsRelation = [self.currentUser relationforKey:@"friendsRelation"];
    PFUser *user = [self.allUsers objectAtIndex:indexPath.row];

    if ([self isFriend:user]) {
        cell.accessoryType = UITableViewCellAccessoryNone;

        for(PFUser *friend in self.friends) {
            if ([friend.objectId isEqualToString:user.objectId]) {
                [self.friends removeObject:friend];
                break;
            }
        }

        [friendsRelation removeObject:user];
    }
    else {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
        [self.friends addObject:user];
        [friendsRelation addObject:user];
    }

    [self.currentUser saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
        if (error) {
            NSLog(@"Error: %@ %@", error, [error userInfo]);
        }
    }];
}

#pragma mark - Helper methods

- (BOOL)isFriend:(PFUser *)user {
    for(PFUser *friend in self.friends) {
        if ([friend.objectId isEqualToString:user.objectId]) {
            return YES;
        }
    }

    return NO;
}

@end</p>
            ```