You call them and set up an interview when you are able to. The interview is very chill and easy. They will just ask you a few questions and tell about being a proper lifeguard.
I applied online. The process took 2 weeks. I interviewed at Crystal Aquatics in Nov 2017
Interview
Very easy, the interviewer did not ask a lot of questions/very hard questions. Was pretty quick and then I was quickly hired after that. Didn't need to prepare at all and it was fine.