I think the normal procedure for your first order is to send it (the order) in with all the required paperwork via snail mail. If you’re in a hurry and also want to make sure it gets there use a Priority Mail pre-paid flat rate envelope for $7.95.
See the section on “Order Forms” on their
Ordering Information page. Note that they have clarified that a notarized copy of page 2A must be submitted for ammo and parts orders. Page 3A is the actual order form where you can order whatever it is you want. Just down load the oder form from
https://thecmp.org/wp-content/uploads/1orderformfillable.pdf?ver=052620 . The included instructions are quite complete.