Since your return has been submitted, wait until your return has been processed and you receive your refund or conformation that any tax due has been paid. (If you file an amended return while you first return is being processed it can cause extended delays for both returns if two returns are in the system at the same time).
See this TurboTax FAQ for help with amending:
How do I amend my 2019 TurboTax Online return?
You can check the status of your amended return here but allow 3 weeks after filing for it to show up:
Where's my amended return?
Amended returns can only be mailed - allow 8-12 weeks for processing.