What should i put in box 7 of my ssa 1099?

You are using the wrong section of the program to enter a SSA-1099.  Delete the Form 1099-R you have been entering.  Box 7 on a SSA-1099 is your mailing address.

To enter Social Security benefits reported on form SSA-1099

• Click on Federal Taxes (Personal using Home and Business)
• Click on Wages and Income (Personal Income using Home and Business)
• Click on I'll choose what I work on (if shown)
• Scroll down to Retirement Plans and Social Security
• On Social Security (SSA-1099, RRB-1099), click the start or update button

Or enter ssa-1099 in the Search box located in the upper right of the program screen. Click on Jump to ssa-1099