How to connect a dataset to a PaidPlans collection?

I want to use the wix #paidplans api to show or hide certain plans on click of a certain button. the documentation says:
Get a list of membership plans from one of:
1. A #dataset connected to the Plans collection.
2. A query on the Plans collection.
I already made some plans in the #paidplansapp, how do I connect these to a dataset as mentioned in 1. ? I dont see the plans collection when I create plans in the the #app. I think I am missing something