You posted your question from online Self-Employed. If you are using online, you are confused about how the pricing works for online vs. the CD/download software.
When you use Online TurboTax, you get one return per fee. Each return needs its own account and user ID. If you use the same account and user ID for a second return, you overwrite the first one and lose it forever.
When you use Desktop TurboTax, which you install from a CD or download to your own hard drive, you can prepare and e-file multiple returns for the cost of the software. You can e-file up to 5 Federal returns—more if you mail the additional ones. If you have multiple returns to prepare for family members, Desktop is more cost effective.
If you are using the Desktop CD/Download program you can do unlimited returns and efile 5. Go up to File-New.
But for the Online version. Online is only good for 1 return per account. But you can use the same email address for 5 accounts. How to start another return in the Online version
Or go to the IRS Free File programs
Free File: Do your Federal Taxes for Free | Internal Revenue Service