If Social Security is your only income for the year, you are not required to file a tax return.
If you are filing a tax return, you must include your SSA-1099. The Social Security Administration mails Form SSA-1099 to you in January. If you need a replacement Form SSA-1099 see the following FAQ on the Social Security web site.
How can I get a form SSA-1099/1042S, Social Security Benefit Statement?
To enter your SSA-1099 in TurboTax, type ssa-1099 in the Search box, then click the link that says "Jump to ssa-1099."