I'm trying to teach myself how to use SolidWorks. I'm working with this tutorial:  How to create 17 inch car wheel  but I can't for the life of me do Step 4. I either cut the rim off the wheel, or I get rebuild error messages. I've attached my drawing file. Can anyone please advise me as to how to "Insert sketch on edge wheel face, sketch for arm hole"? I'm having trouble figuring out exactly where to attach the sketch. I'm not sure if I'm even working the correct face!

Thanks!