How to vote for tag synonym?

Question

I am sure this was asked before, but I couldn't find it.

So, when I tried to vote on tag synonym, I got this :
You do not have the required score on this tag to vote for this tag synonym

So, what score do I need to vote for tag synonym?
What is the reason for this?

possible duplicate: meta.stackexchange.com/questions/89564/cannot-vote-on-synonyms — clairesuzy, Commented May 22, 2011 at 12:05
@clairesuzy Yes, that answers what score do I need, but on which tag (the 1st or the 2nd tag?). And what is the reason for this? — BЈовић, Commented May 22, 2011 at 12:09

Community · Accepted Answer · 2017-05-23 12:35:38Z

The criteria for proposing a tag synonym are as follows:

You must have at least 2500 reputation.
You must have a total answer score of 5 or more (total upvotes minus total downvotes) on the master tag (not the tag you're proposing as a synonym).
If a tag has more than 50 questions in it, the proposed synonym tag cannot have a question count greater than 1.25x the master tag.
You may not suggest any synonym that is already suggested on another tag.

The criteria for voting on a tag synonym are as follows:

You must have a total answer score of 5 or more (total upvotes minus total downvotes) on the master tag (not the tag you're voting on as a synonym).

Synonyms are automatically approved when they reach a score of 4, and automatically deleted when they reach a score of -2.

note that we relaxed some of the synonym rules for low-count tags and when the counts are "similar" between master and synonym — Jeff Atwood, Commented May 22, 2011 at 23:32

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