how to show add to cart instead of select options

Hello,woocommerce admin, iam using the newest wordpress and woocomerce,i use variable product, and all the product show select options on the thumbnail, but i want show the add to cart, how to do it?

you can see my web: http://www.shineyifashion.com

and you can also contact to my email: hexia2082@163.com

thanks.

https://wordpress.org/plugins/woocommerce-admin-bar-addition/