I don’t understand how I apply for a student credit?

If you are the student and your parents claim you, they will claim the credit. If you are filing on your own, you may qualify. 

See:

• Where do I enter Form 1098-T (Tuition Statement)?
• IRS Q & A about education credits

In TurboTax (TT), enter at:

Federal Taxes Tab (Personal for H&B version)

Deductions & Credits

-Scroll down to:

--Education

  --Education Expenses and Scholarships

 

But, be aware that there's a new urban myth among college students that says they can get a $1000 from the government just for filing a tax form. For most of them, they simply aren't eligible. A full time unmarried student, under age 24, even if you don't qualify as a dependent, is only eligible for the refundable portion of the American Opportunity Credit if he supports himself by working. You cannot be supporting yourself on parental support, 529 plans or student loans & grants. It is usually best if the parent claims that credit. 

You cannot claim a credit if you are claimed as a dependent by someone else.

 

Reference: Line 7 instructions for form 8863. https://www.irs.gov/instructions/i8863