CKeditor-How do you activate a plugin?

[scootball]

Are the only changes that need to be done in the gsconfig.php file? I've been trying to change it, but none of the changes are taking effect. I also noticed that my gsconfig.php file was set to 'advanced' but only the 'basic' tool bar was appearing when in the page editor. I did manage to break it once, then had to install my backup file config file.