You don't choose your sections at this date. You'll do that in August when SOLAR re-opens. So don't worry about the profs just yet. This date is just for picking courses and which term you want them in
You can log into MUGSI at any time but SOLAR will only open after 12:00.
And for co-op, the course is Engineer 1EE0. I think it'll be there... I didn't pick the course until 2nd term so if you forget, no worries
And the WHMIS course under SOLAR is called WHMIS 1A00
So to summarize, in addition to the regular engineering courses, you have to add WHMIS 1A00 and Engineer 1EE0