I've been invited (for the first time) to review an edit someone made to my post on SO, but I've only got 1609 rep and the buttons to accept etc aren't showing, even though the two versions are displayed side by side. It's a good edit correcting a silly mistake. Two reviewers who don't frequent our tag rejected it, but the reviewer who does correctly accepted it. I'd like to accept it, but don't think I can. Should I just edit my post myself and thank the edit suggester in a comment? (I thought it might be a browser bug, but two different ones don't show me any buttons.)
The reason you don't see an option to accept is because the edit has already been rejected by two reviewers. It only takes 2 votes, there is no option to repeal that vote, I'm afraid.
Fix the post yourself (thanking the Good Samaritan in a comment perhaps). If you really feel generous, find a good answer or question by that editor and give it an upvote. That'll more than repay the missed +2 reputation.