How do I change my ssn on my taxes?

Not really sure what you are asking?

You can't just "change" your social security number. You get a number, and it's yours for life.
Unless you get into some type of witness protection program, you can't just change it.

If you entered it incorrectly, contact the IRS office in your area, I'm sure they can direct you in the process to correct an incorrect entry.

Hope that was your question?

how do I change my ssn on my taxes?

If you entered a wrong SSN in your tax return, chances are that you will get a letter from IRS.

You should call IRS and tell them about the mistake.