I filed my taxes as a employee but now I’m trying to file my taxes for self employment. I drive for Uber and Lyft, but the app doesn’t give me the option to file

You only file ONE tax return with ALL of your income.  Uber & Lyft would be self-employed income reported on a schedule C that is part of your tax return.   You will have to amend the return already files to add that.  You will probably need to upgrade to Deluxe for schedule C if  you do not want to deduct your expenses otherwise upgrade to the Self-employed version for the full schedule C.

You should *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). In addition, if the IRS makes any change on your original return, you might end up having to amend the amendment – a sticky process that can take a year or more).

-- Then you can start the amend process.

-- Amended returns can only be mailed - allow 8-12 weeks - can take up to 16 weeks (4 months) for processing.

See this TurboTax FAQ for help with amending:

https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed

You can check the status of your amended return here but allow 3 weeks after filing for it to show up:
https://www.irs.gov/filing/wheres-my-amended-return