How do i enter the license code on my phone

You can't use it on a phone or mobile device.   Do you have the 16 digit License Code?  You need to install the Desktop program on a full Windows or Mac computer.  Did you accidentally start in the Online web version?

Do you have a computer?  How to get started with the Desktop program, install and activate it
https://ttlc.intuit.com/turbotax-support/en-us/help-article/product-delivery/download-software-turbotax-com/L7u9oLEkq_US_en_US?uid=luqgvzrd

2024 Turbo Tax Desktop Download System Requirements
Windows 10 or later or Mac OS Ventura 13 or later (newer). 
https://turbotax.intuit.com/personal-taxes/cd-download/tta-system-requirements

Are you using TurboTax Desktop?  That version needs to be downloaded to your computer. You can't use the download version on your phone.  

For additional information, refer to the TurboTax article How do I install and activate my TurboTax Desktop product?

Refer to the TurboTax article How do I use the mobile app? for instructions to use the mobile app.