Fafsa and tax return

I am filling out the fafsa for the spring semester of college and I was presented with this question, "Enter the amount of your income tax for 2018. This is the total amount of IRS Form 1040-line 13 minus Schedule 2-line 46." I have no idea what "Schedule 2-line 46" is. Line 13 says "Subtract line 12 from line 11". If zero or less, enter -0-". For my tax return, Line13 has 0 as the amount, line 12 also has 0 as the amount, and line 11 also has 0 for the amount. I have no idea what line 11, 12, and 13 are for

 

I am a single 20 year old male, I live with my mom because I am in college and she claims me as a dependent. I made $10,855 last year (Wages, Salaries, tips, etc) and got $1,096 back on my 2018 tax return