My refund is not on my prepaid card. I've already activated it 3 days ago. Do I need to contact green dot or will the refund be added?

Your refund will be added when it becomes available. 

Once the IRS accepts your tax return, it usually issues refunds within 21 days. To learn more and for the most up-to-date info from the IRS, visit www.irs.gov/refunds.  For information about your state refund, contact your state government agency.