I need to add a new person (my daughter) to my account, but the system does not allow me to.

[kappy_kling]

I need to file for my daughter, but I am not finding a way to add another person. I tried starting again in TurboTax, but unfortunately, it won't allow me to as it has my email

[DoninGA]

The TurboTax online editions can only be used for one tax return per account and User ID.  You will need to create a new account with a new User ID and a new email address for another tax return.

Go to this website and click on Sign up to create a new account - https://turbotax.intuit.com/personal-taxes/online/file-your-own-taxes/

[SharonD007]

TurboTax Online requires a separate account for each person. You will have to create login ID's for each tax return that you prepare.

If you use TurboTax Desktop, you can e-file up to five federal tax returns.

Refer to the TurboTax Help article: Can I file multiple returns with TurboTax?