I need to set a fixed amount on every order. I cant seem to get it to work in nopCommerce 1.50.

I've tried all the built in shippingmethods but all of them calculates from weight or order total or such.

I've also tried this module for 1.40 https://www.nopcommerce.com/extensions/3/shipping-modules.aspx
But I can't get it to work with v.150

Anyone got an idea on how to do this?