how do I get a valid boarding pass

With your valid flight ticket, you get a 6-character confirmation code from the airline (e.g. FR3BG6, YCDQJ7). Walk into the departure lobby where you can check your bags in. There are many kiosks around this area. Using your confirmation code, you can get the kiosk to print out a paper boarding pass for free. This is the easiest way to get a boarding pass, and you seldom have to wait in line to use these kiosks.

On line. We were able to download to phone so we scanned at the gate. It was easy. We checked bags in went thru security and down to gate.

Purchase a ticket through a travel or airline website.