"as long as your return flight is within 15 days of your attempt to print a boarding pass"
So THAT'S where I was going wrong.. I'm going away for 7 days, so right now it's longer than 15 days until my return flight, so it would make sense that I can't print that boarding pass now.. Thank you! Ahhh..
If I have already checked in to print the first boarding pass, will I be allowed to check in again to print the return as well?