Installed Woocommerce plugin not working.

Hi.

I purchased the woocommerce 'Product Add-On' extension from Woogang but it doesn't seem to update the product page as required. I am just trying to add a text box so the user can enter a name for a personalised product.

I have contacted Woogang and waiting to hear from them but just wondering can any of you guys help me with this.

I can give access to the site if required.

Website: http://www.songsforzoey.com