If you are entering social security benefits that you received, there is no place to enter a Federal Identification Number. You may be trying to enter them in the wrong place. Type form SSA 1099 in the search box and click on jump to form SSA 1099.
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.
If you only get ssi or SS or SSDI it is not taxable and you do not have to file a return.
Try going to the search box and type in SSA-1099 or Social Security Benefits. That will give you a Jump To link to take you directly to it.
Enter a SSA-1099, SSA-1099-SM or RRB-1099 under
Federal Taxes on the left side or top
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
Up to 85% of Social Security becomes taxable when all your other income plus 1/2 your social security, reaches:
Married Filing Jointly: $32,000
Single or head of household: $25,000
Married Filing Separately: 0