If your only compensation is from self-employment, your maximum Roth IRA contributions is net profit (Schedule C line 31) minus the deductible portion of self-employment taxes (Schedule 1 line 15). That would just happen to be the same as your AGI if you have no other items on Form 1040 lines 1 through 7 and nothing else on Schedule 1 which seems to be the case here, but that's often not the case.
No problem using the CD/Download version of TurboTax Deluxe for self-employment income. That's the version that I use for preparing my own tax return with self-employment income. Yes, you can use this version for amending.
Other than a bit of editing for clarity, nothing changes in my original reply.
