Post a tag as answer which needs reworking (delete, merge, rename etc). I will fix simple issues of tag synonyms or renaming but some tag proposals can only be fixed by discussing with fellow users. So, votes on tag proposals will be used to fix them.
Up vote = "I agree this tag need cleaning"
Down vote = "I disagree this tag needs cleaning"
Also, don't forget to mention the reason in comments.
Actually, Users with more than 1250 reputation (on beta sites) and a total answer score of 5 or more on the tag, can suggest tag synonyms. Users with a total answer score (total upvotes minus total downvotes) of 5 or more on the tag, can vote for tag synonyms. Suggestions will be automatically approved when they reach a score of 4, and automatically deleted when they reach a score of -2.
If you are confident about synonyms, you can suggest directly and get approval (given you have required score in that particular tag). If you are not so sure, you can suggest in answer and this can be decided by votes.
But i suggest you to post here the even simple tag cleanup proposals and i will fix these issues as soon as possible. Also, post only one tag issue per answer.
For more details on tag cleanup, visit Meta SE post: What are tag synonyms and merged tags? How do they work?