Building an Iphone app task 2 of 2 sorry but i pressed help on the task it does not let me ask for help

We learned about instance methods before. For this task, add an instance method to Post.

Name the method description. It takes no parameters and returns a string that describes the post instance. For example given a title: "iOS Development", author: "Apple", and a tag named "swift", the description would read as follows"

"iOSDevelopment by Apple. Filed under swift"

Once you have an instance method, call it on the firstPost instance and assign the result to a constant named postDescription this is my code struct Tag { let name: String } let firstTag = Tag(name: "swift")

struct Post { let title: String let author: String let tag: Tag

func description() -> String {
    return "\(title) by \(author). Filed under \(tag.name)."
}

} let firstPost = Post(title: "iOS Development", author: "Apple", tag: firstTag) let postDescription = firstPost.description()