Where do i get payer TIN for social security?

If it's asking for an EIN number you are entering it in the wrong place. There is no EIN on social security SSA-1099.  So delete it out of here and go to......

Enter a SSA-1099, SSA-1099-SM or RRB-1099 under

Federal Taxes (Personal for Home&Business)

Wages and Income

Then scroll down to Retirement Plans and Social Security

Then the second line - Social Security (SSA-1099. RRB-1099) - click the Start or Revisit button

1040 line 6a is the gross Social Security amount and 6b is the taxable part of Social Security.

There is no Payer ID for a SSA1099.  You are trying to enter it in the wrong place.

 Go to Federal> Wages & Income>>Retirement Plans and Social Security  (SSA1099 and 1099RRB) to enter your SSA1099.