How to Edit in WordPress

I have put this plugin folder into the correct place, and have activated the it in WordPress, but now what? When I did this for WooCommerce it showed up in the sidebar and I could edit it from there. Where do I go to edit this plugin?

(I am new to the world of WooCommerce and WordPress)

Help!

http://ww.wp.xz.cn/extend/plugins/woocommerce-invoice-payment-gateway/