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Why can is this happening --> You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory. Please help!

Tried to install Rails and others...

This happens because you're not running as a superuser. To run as a superuser you type the sudo command before the name of the tool that you're using. This should fix that problem you're having.

If that doesn't work you can try to do: chmod +w /the/path/to/the/directory/goes/here

Note, you might need to use sudo to make changes with chmod.