Add to cart functionality

Hello, this is the first time I’m using Glide as it’s needed for a school project. The simple store template provides nothing for that and I have looked it up but found nothing.

I noticed there was a solution posted for this but I’m assuming it’s for the paid version of this app because it doesn’t work for me(says it’s an error). Can anyone please help me with the free version of Glide?

Add to cart is only available for paid plans.