I'm trying to figure out how to amend my taxes need to add income for my claimed/dependent 16 yr old daughters 3 w-2's but I can't seem to figure out how or where

[ADRI89]

if you scroll down to the bottom of you tax page were it show your acceptance date it on the right side it says 

• Amend (change) return
• Download/print return (PDF)
• My Docs
• Smart Insights™
• View adjusted gross income (
• View order details
• View efildetails
• Download .tax file   click the amend change return 

[MichelleLO]

Please see How do I amend my 2019 TurboTax Online return? for assistance with amending your return. 

[VolvoGirl]

You don't include their income on your return. It would only go on their return if they are required to file one.  To file a separate return for your dependent you need to set up a new account.  Online is only good for one return per account.  You can use the same email address for 5 accounts.  They can probably use the Free Edition.  How to start a new online return

Https://ttlc.intuit.com/questions/1894512-how-do-i-start-another-return-in-turbotax-online 

Or the Free File website.  In order to use the Free File program, you have to start it at a special website.  Click on the Orange button I Qualify, Let's get Started

https://freefile.intuit.com/

Be sure on their return they check the box that says they can be claimed on someone else’s return.  If their only income is W2 and under 12,200 they do not have to file a return except to get back any withholding taken out.

Filing requirements for a dependent

https://ttlc.intuit.com/community/children-dependents/help/do-i-need-to-file-my-own-taxes-if-i-m-a-d...