just do it bro its not hard /j

You need to watch the video in the description

if you downloaded the module correctly instead of ignoring the description then click the little gun icon in the gwater menu ( the one where you have to press g ) and it will give you a water gun to shoot water with, or you could just go to entities go to gwater and select the different sizes of water. hope this helped! ( if you even still have this problem considering its been like a month )