In the admin panel products -> manage products ->edit product you can customize the quantity or allow the user to edit the quantity. I have enabled the "allow user to change quantity", but am not given the opportunity to change the quantity during the user signup process. My settings for this product are: First Price: $0 First Period: 30 Days Second Price: $99 Second Period: 1 Month I appreciate the help in advance.
This setting affect only shopping cart module. User will be able to change quantity in /amember/cart/