Why is this software so unintuitive ?!

It can't even plot a vectorfunction, and when i finally found out (wich took a looong time because there is no help to get out there) i discovered my need for having to plot 2 functions in 1 graph wich is impossible !!

This is a ridiculous piece of software that i wouldn't even use, even if i got money for it !

I have fought to make this work because i had 3 small assignments to do, and thought they would be nice...