I have an extra w2 i had forgotten about how do I add it to my already completed tax returns?

If you need to add any information to your tax return, you would need to file an amended return. 

You can follow the instructions here to amend your return. 

I am in the same boat and the "instructions" everyone shares about amending is a nice read, but the option is not there yet for 2019. My return was already direct deposited and all it says for me under Amend is to check back late February.

Late February is the best we can give as far as a time to amend your return. You can use the link provided below once you can amend the return:

How do I amend my 2019 TurboTax Online return