Are you referring to Box 12d? What you do with the information will depend on the code associated with Box 12. Provide the code to this thread for assistance in resolving your issue.
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You don't enter Lyft or Uber under W2 section.
How to enter Lyft tax info
How to get the Lyft discount
Tax Tips for Uber, Lyft, Sidecar and other Car Sharing Drivers FAQ
You will need to file a schedule C in your personal tax return for self employment income. You will need to use the Self Employed Online version to fill out schedule C or any of the Desktop programs.
Here is some reading material……
IRS information on Self Employment….
Pulication 334, Tax Guide for Small Business
Publication 535 Business Expenses
most likely you are an independent contractor (IC) and don't get a w-2. Your Lyft income and expenses are not entered through a w-2 form you should have gotten a 1099 if an IC. then your income and expenses are reported on schedule C.