I’ve had some reboot users report that signing up for OnShape can be a pain. Well I’ve learned what happened and the good news is that there is no need for difficulty! What you should NOT do is go to onshape.com and sign up. They will try to sell you a paid account. Instead, go to this link and sign up directly for the free account.
Hopefully that should be a painless way to sign up to OnShape. Then you can View and Modify the Rover and Skittles design files, which really makes it easy to start building some of these robots!
If you want to get started, see the design files here: