I currently have over 3500 reputation, 1500 is the rep to accept an edit. I can even see that there is a pending wiki tag edit in the queue. But, I'm not allowed to approve it. Are all tag wiki entries. I'm the #2 answerer of the tag, with over 50 up votes, but I can't approve it... Doesn't quite make sense to me. What's going on? Thanks!
You should be allowed to submit edits to any tag wiki, unless there is an edit in the pipeline. When you reach 4000 rep (as this is site is in public beta) you will become a trusted user and be able to edit wikis without waiting for approval.