how do I get my 1099 for ss

Go to this SSA website for how to get a copy of the SSA-1099 - https://www.ssa.gov/faqs/en/questions/KA-01723.html

Your SSA-1099 for your social security income should have been mailed to you already to the address that the Social Security Administration has on file for you.

Or you can go on the Social Security website and request your SSA1099.   Go to www.ssa.gov   You have to create an account with a user name and password.