You have to apply through the website, and pick the store you want to work at. Then you talk with the HR at the store level with a face-to-face. For hourly spots, they often will have pre-printed/chosen questions to ask, based a terrible computer program they rolled out not too long ago, and your own background. There isn't anything formal, you just have to not sound like a complete moron. For salary, you talk with the store manager, and it's a longer process, (though usually futile because they typically promote from within).

The interview process was very average to their competitors. They ask 4-6 questions and most are about managing a team and the environment you would expect to work in. I.E warehouse work and safety. Keep these things in mind when going into the interview.