Difficulty adding 'Add to Cart' and Quantity selector to Express Theme Featured Collection

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Hi there.

Our store is: www.doughnaughty.myshopify.com

We have a clunky add to cart system right now, with the Express theme you have to click on each doughnut you want and then add to cart within each pop up. 

We would like the pop up system to remain (so that customers can get more information) but for speed also be able to select quantities and adding to cart directly from the main page. 

There are a variety of suggestions that already exist, but when I add the <form> type tags, they are not clickable and it simply loads the pop-up again.

Any help?

Would also like the cart drawer to slide open after a quantity is added so the customer knows what they have selected.