Blindwrite Newb - Sims

K, my first time using blindwrite to back up my sims game .i made an iso but there was this last step that had this box and a yellow line at the left that i skipped since i have no idea what to do . im guessing i messed up since i tried to burn the iso and it wont let me . is therea step by step somewhere or somone who will give me instructions that make sense for a newb , please

step by step? have you even read this thread?