Earned or Net Income for Roth IRA

I’m self-employed and receive 1099-NEC from a company.

Since my income is not much this year, it’s confusing which to consider for Roth IRA. I already filed my tax return and which line should I look for when deciding how much I can contribute to my Roth IRA?

From 1040 (Federal Return Summary)

1. Total Income vs Adjusted Gross Income
2. Should I subtract Self-employment Tax from either Total Income or AGI?

From Schedule C

1. Gross Income (line 7)
2. Net profit (line31)

Thank you.