Question

change g-2-g tags

Answer 1

Did you accidentally post this before you finished with it?  If you're wanting to change the tags you're following, you need to go to your profile and click the edit button below the list.  If you mean the tags tab above, I'm not quite sure what their use is except to let you select tags you'd want to have the people who follow be sure to get an e-mail / link to.

Comments

Looking at you profile I see the problem seems to be at least removing the Buffalo tag which has spaces in front and therefore doesn't show green.  While you're in the edit mode for the tags if would be nice if you could put a sentence or so in the comment box of each tag concerning why you're following them.  (click the edit comment button next to the tag and then save each comment.