Hey #BikeTooter!

How do I mount a bike on this type of bike rack?

I know that I hang the front wheel on the uppermost piece, and I know I ratchet in the front and back wheels on the top and bottom. But what about the arm? What does it clamp onto?

The rack is Thule, but I couldn't find this type of rack on the their site for instructions. Bonus points if you can find me exact instructions, or photos of a mounted bicycle.

If you're curious, this is a Genentech shuttle - I don't work for Genentech, but as someone working in Oyster Point I can ride their shuttles!