That's pretty easy, you use the self-service kiosk at the airport. You insert your booking reference or the credit card as identification.
There are some simple instructions to follow and you will get your boarding pass and baggage tags directly from the kiosk. Then just attach the tags on your bags and leave them at the "Baggage drop"
To check in, you will need your payment card or your booking reference.
More information about self-service kiosks