How do I set up direct deposit for my refund

Once you have filed your tax return, you are no longer able to update your direct deposit information. If your refund is rejected by your bank, the government will mail you a paper refund check. Please  see What if I entered the wrong bank account for direct deposit? for more information.

I got 2 emails that said to finish setting up my card. To set up Direct Deposit. I tried and can't  figure out how to do it. I wanna say direct deposit is already set up.