I filed my taxes in January, said something about signing whatever form of papers I didn't receive through mail. It says I can E-file but doesn't allow me. What can I do?

So you did not efile it in January?  Or it was rejected?  Does it say Printed or Ready to Mail when you log in?   If you don't efile you have to print and mail it yourself.

You can try to switch to efile. Click on Add a State to let you back into your return
https://ttlc.intuit.com/community/e-file/help/how-do-i-change-from-mail-to-e-file-in-turbotax-online/00/26985

If you need to mail it.  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/01/26258

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.