you don't. you wait for applications to open up again, and then you go for trainee. then you can slowly work your way up through the ranks to get there

You can't. You must go to applications and wait for them to open. Then, you must apply using the most effort you can by this I mean, if you really want staff you must show that you are up for the job, and even spend at least one hour on each question of the application. Make sure its long! Good luck.