multiple subscriptions

Hello - I created a test form and linked Authorize.net (my payment processor).  In settings, I also specified that a user should be allowed to select more than one product.  When I'm looking at the form, there's no way for me to select multiple products?  Can you advise?  Thank you,

Dorota

The multiple product does not work for subscription type. Only for product type:

Let us know if you need more help.