how can I review my schedule C to make sure I didn't cause an error during the review part?

If your schedule C for the rideshare is reporting income or expenses that shouldn't be there then you need to either go back through all of the information that has been entered there and review it to see that it is all correct or delete the schedule C and start over.

The only way to review the actual form is to go all the way to the end of the return and pay for the software.  Then, BEFORE YOU FILE YOUR RETURN, the system will allow you to save your return as a pdf file and you will be able to review all of the information on it.  You can then go back into the return and adjust anything that would need it before you submit the return.

@andrewrayherndon