Well, you have to contact our director, Dr. Barr and set up an audtion with him.
After you have the audition, he'll tell you right after whether you've been accepted or not.
For the audition, have a part or whole song prepared to sing...it can be any genre of song (just make sure it's appropriate to sing in a chapel, i.e. don't sing T-Shirt and my panites on, etc.)
He'll ask what your voice part is (i.e. alto I or II, soprano I or II etc.), if you can play an instrument, how you feel your music reading skills are, he'll have you sight read a song out of a hymnal....and maybe some other things. Overall, it's an easy audition.