I had a C33, and if I recall, there is a cylindrical metal knob at the upper right corner of the film back that activates the frame counter when closing the back.
It is different on the 220 back than the 120 back to allow for frames #13-24.
The pressure plate should be factory set for the thinner film.
Loading is the same as 120, but be aware that SOME 220 film has 2 Start Marks on the paper...if so, use the second one, usually an arrow.
(The first Start Mark is usually a row of dots, used for some specialized equipment that doesn't exist any more).
It will be obvious, but you need to be aware of it if you haven't used 220 film before.
Also, be aware that Aerocolor film has a serious light-piping issue, so be sure the film rolls up tIghtly, is protected from light, and is loaded into a processor in total darkness if processed by a commercial lab.