I want to mail both my state and federal returns

How to switch from Efile to mail.  This one has a Video

https://ttlc.intuit.com/community/print-and-file/help/how-do-i-switch-from-e-file-to-file-by-mail-in-turbotax-online/00/26314

How to mail a return from the Online version

https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online/00/26258

Be sure to attach copies of your W2s and any 1099s that have withholding on them.  You have to mail federal and state in separate envelopes because they go to different places.  Get a tracking number from the post office when you mail them for proof of filing.

In the File section of the program on Step 3 you can select that you want to mail the tax returns.