So here is the link of the addon: 

<http://www.woothemes.com/products/product-add-ons/>

I want to find the template to make some changes and mainly to change places of the two fields: so the field with checkboxes is going second and the description field is third. 
There is a link with all the addon files(a bit modified but it is generally the same). : 
<https://github.com/nextime/woocommerce-better-product-addons>

So I would be so happy if you help me to find the place where I need to modify