The student loan interest deduction is claimed as an adjustment to income on IRS Form 1040. In order to qualify for this deduction, the student loan must have been taken out for either the taxpayer, their spouse, or their dependent(s). If you do qualify, you can take both the student loan interest deduction and the standard deduction.
Please note, if the student is the legally obligated borrower, a parent who helps with repayment cannot claim the deduction. The repayment and therefore the interest deduction goes to whomever is legally obliged to pay it back.