custom second button on single product page

[getdigital]

Hi there,

 

I have purchased an module to let my customers design their wooden phonecase.

On the product page there is the option to place the item to the cart.

I would like to have a second button so that the customer can go to the case designer to design his case.

 

Can annybody tell me how to do this and point me in de right direction.

 

Thanks and best regard from the netherlands.