Very simple. You go into the office and sit down across from whoever is available to interview you. Usually it's a shift lead or an assistant manager. The interview goes by pretty quickly because they're basically talking to some random person instead of working out there on the floor or in the stockroom. The next interview is usually with the store manager himself/herself. That second interview is basically a sign that you have the job as the manager will get to know you a little in a more casual way and explain basic things like how customer service is important.