Probably the best option is to contact TurboTax Technical support through the "Contact Us" menu option in the top right corner of the TurboTax screen. This will allow a representative to follow along in Screen Share and point out specific steps.
However, if you just want the upgrade to "Self Employed" gone you could "Clear and Start Over" and fill everything out again without entering the information that prompted the "Schedule C" the first time.
This is accomplished by Clicking "My Account" from within your Tax Return and selecting "Clear and Start Over"
(The options available in the "My Account" context menu vary depending on whether or not you are actually in the edit mode of your tax return).