How do I mail in my tax return?

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.

Where to mail federal paper returns

https://www.irs.gov/uac/where-to-file-paper-tax-returns-with-or-without-a-payment

I would like to know why am not getting my refund 

From when?  A 2020 or 2021 return?