This is what you need to do. Put the call in your mouth and push it up to the top of your mouth and as far forward as you can get it, with the open end to the front of your mouth. Now say SHOW! This will put your tongue in the proper place to make sound. But beware, the tickle to your tongue you won't be ready for. But you will get used to it. Then you have to learn to control pitch. Push the reeds to the top of your mouth and the pitch will go up, let it back down and the pitch will drop. This is step 1, when you have that down let me know and we will move on to step 2.
Gselkhunter