Self-Employed version is TurboTax online. So you will just use the steps here below to edit your Schedule C if you have not already filed the return.
If you have already filed the return, you will need to wait until the IRS has accepted or rejected that return.
If accepted, after you have received your refund, you can go here and get instructions https://ttlc.intuit.com/questions/3402261 for amending that return.
See some reasons you'd need to amend your return here https://ttlc.intuit.com/questions/1908543