In most situations there are things you can do to get back your eligibility.
Is it possible to get federal student aid funds if I have been convicted or pled guilty to a crime involving fraud to get federal student aid?
You will absolutely have to repay the funds to the US Department of Education or to the federal student loan holder or servicer.
Regarding the basic eligibility criteria, what should I keep in mind before signing the certification statement?
you don't owe money on a federal student scholarship,
How can I show that I am qualified?
Do you have a high school diploma or a recognized equivalent such as a General Educational Development GED certificate?
no
have you completed a secondary education?
yes
then you may qualify for a college or career education
and should I register for the selective service?