Essays / Tips on writing UBC Supplemental for Business? [4]

Hi everyone,
My UBC business application is due in a few days. I'm trying to apply to first year. I've been stupid enough to put it off for this long, but I need tips on writing a good supplemental? I know they want us to write something personal, but how do they want us to write it exactly? Do they want an essay format? Or like a story format? And what exactly are they looking for?