Add Quantity Buttons to Debut Theme - not working

[MWolff]

Hi! I add the code that some people posted some time ago to add the quantity buttons (+ and -) on my Shopify store.

However, the button is there but the quantity is not changing up when the up or down are clicked. It's frozen on #1.

Please, can someone help me?  Also, can someone help me to add + and - buttons on my checkout page as well? 

mwchocolates.com

P: glawbu