@car377
Sorry to bother you again, I just wanted to let you know that I found a solution, it is actually possible to modify schedule C in TurboTax online, I found the steps here in the community.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/self-employed/pay-zero-social-security-s...
Now I just hope that my certificate of coverage will be accepted with my return.
Thank you again for helping!
