Hey guys, long story short, I hit a barrel on the way to school this morning. The mirror folded in and the glass itself fell out of position. The mirror folded back out successfully, but I can't figure out how to snap the glass back in...

Could someone please give me instructions on how to put the glass back in place? I'm in school and would really like to fix it before I go home and have to confess to my parents.

2003 jaguar x type, 2.5