I filed a Form 1040 and now need to file a second Form 1040 for my daughter. How do I do that?

CD/download?  That is the desktop version of the software. Go up to File and then click Start New Return.

If you are using the Desktop CD/Download program be sure to first save your return with a name you can tell apart from your daughter's return.  If you both have the same first name it might save her return over yours and replace yours so yours would be gone.  Go to up to File - Save As.

https://ttlc.intuit.com/questions/3995321-how-do-i-start-a-second-return

Or try here:

www.taxfreedom.com