How can i go back and fix my return once i have already submitted? the federal has been accepted the state in pending. I need to add a dependent and take out one w2

You can't; you'll have to amend.

You will have to file an amended return to make the corrections. Go to the following link for instructions to amend a 2018 tax return that you filed with TurboTax Online.

https://ttlc.intuit.com/questions/4667226-how-do-i-amend-my-2018-turbotax-online-return

An amended return has to be filed on a special form, Form 1040X. It cannot be e-filed. You have to print it, sign it, and file it by mail. It takes the IRS up to 16 weeks to process an amended return.

Don't file the amended return until your first return has been accepted and you have received the original refund.