You will report your Lyft income under self-employment income...Even if you don't get any 1099s you are responsible for reporting and paying taxes on all the income you receive. If the ride-share operator processed more than 200 transactions and $20,000 in payments for you, then you should get a 1099-K; similarly, if your non-driving income was less than $600, you likely will not get a 1099-MISC.
Use these steps to enter your income not reported on a 1099:
Type “self-employment income” in the Search box (upper right in screen) and then select the “Jump to self-employment income” link. This will take you to the screen that says, "Did you have any self-employment income or expenses?" from here you can continue on with the interview questions that will ask you information regarding your income from Lyft. (There are excellent learn more links you can click on while going thru the interview if need any further assistance)