How do I amend my 2022 tax return if it's already been accepted? I have a K-1 I need to submit but I don't see that option in the prompt. I have the Premier version.

You cannot make any changes until the accepted return has been fully processed.  After it has been processed you can amend.   Do not try to make any changes at this time.

See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...

It's already been fully processed and I've been paid what I was owed.

If the original return has been fully processed then you can go ahead and amend it if necessary. 

See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...