I need to file an amended return, but can't find that link in my account

To amend your 2022 tax return: Wait to see if your return has been accepted or rejected by the IRS or state. If rejected, you can correct and re-send your return. If accepted you should wait until your return has been processed and you receive your refund or confirmation that any tax due has been paid. If you file an amended return while your first return is being processed it can cause extended delays for both returns if two returns are in the system at the same time. In addition, if the IRS makes any change to your original return, you might end up having to amend the amendment. Amended returns can be e-filed or mailed - allow 8-12 weeks - can take up to 16 weeks (4 months) for processing. 

Be sure to save a copy of your return before you begin to amend it. 
Please see this Turbo Tax FAQ on when to amend.

Can I amend a pending return?

Can I amend if I already received my refund?