The Themler WordPress product details template uses a custom "add to cart" button. Could you please let me know how I can use the standard WooCommerce "add to cart" button instead?

I am trying to use a plugin which is dependant on the standard button being available.

The Themler WordPress product details template uses a custom "add to cart" button. Could you please let me know how I can use the standard WooCommerce "add to cart" button instead? I am trying to use a plugin which is dependant on the standard button being available.