How do I add my teenager's income? It only gives me the option to add income for the 2 adults in the home.

You cannot include your child's W-2 income on your tax return. Each child who has a W-2 must file his or her own tax return.

I'm no expert but....They have to do a 1040EZ or 1040 if not a simple summer job situation.  When I was a teenager my dad would still count me as a dependant but I remember still having to do a 1040EZ.

I don't think their income is reported on your taxes.

Good luck!!!

You don't include their income on your return. It would only go on their return if they are required to file one.  They don't have to file if they only have Social Security or W2 income under 12,550 but can file to get back any withholding taken out in boxes 2 or 17.  But you don't get boxes 4 or 6 back.   If they got a 1099NEC for it they do have to file a tax return for it.

To file a separate return for a dependent in the Online version you need to set up a new account separate from yours.  Online is only good for one return per account.  You can use the same email address for 5 accounts.  You can probably use the Free Edition

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

Be sure on the dependent return you check the box that says you can be claimed on someone else’s return.  If their only income is W2 and under 12,550 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-dependent/00/26111