I need to link to my Shopping Cart, directly

I need to link to my Shopping Cart, directly from an outside sales page.

Support suggested that I link from the outside sale page to here:
http://course.makingartmakingmoney.com/memberships/

1. However, that brings people to a page that says "Membership" when they think that they are enrolling in "The MAKING Art Making MONEY Semester."

2. Then the have to "Choose Payment Option" by hitting a "signup" button. It is spelled "sign up." It is two words.

3. Then they click "Enroll Now"

Very confusing.

HOW can I link directly in the shopping carts with the two payment options presented side by side?