The system is not allowing me to add my expenses for Door Dash unless I pay for the premium, which I do not want to do. Why won't it let me add my expenses?

[Opus 17]

That's how turbotax is designed.  If you are self-employed and you need to file a schedule C to report business income and expenses, you must upgrade to the Premium version. 

[xmasbaby0]

Other options:

Use this IRS site for other ways to file for free.  There are 8  free software versions available from the IRS Free File site

https://apps.irs.gov/app/freeFile/

Or—if you live in certain states you may be eligible to use the new IRS Direct File

( AZ, CA, FL, MA, NH, NV, NY, SD, TN, TX, WA, WY )

https://directfile.irs.gov/