Membership Amazon payment gateway

I got the Amazon payment gateway to show in the subscriber payments by uncommenting the M_register_gateway...line at the bottom

But now, the settings don't show, so I can't get it to work anyway.

The code is this

function mysettings() {

		echo "<p>" . __('Placeholder : The settings for the Amazon payment gateway will be here.','membership') . "</p>";

Thanks in advance for helping me out with this...