How can I input my own income data?

Yes.  All income can be entered manually.

Yes, when you enter your income, you will click manually enter my income.  For example, when entering a W-2, you would follow these steps:

1. Click Wage and Income
2. Click Jobs (w-2)
3. Click Add a W-2
4. Enter EIN
5. Click Manually enter my W-2

@jk-kapler