Press your lip down on the reed about 1/2" from the tip. Make a couple of hard puffs while still holding the reed against the tone board. This should make the "yips". Then while still holding the reed down, blow a long drawn out breath thru the call. This will make the howl. Practice this a few times and then start slowly tilting the big end of the up. This will drop the pitch, like a coyote does at the end of the howl. Keep playing with it, you'll find the volume of air and pitch.
In all honesty, most factory howlers are a lot harder to use than customs. Take a look at the calls on the links bleow. Both of these guys make great howler that are very reasonable, Around $30-$40.
http://www.carverpredatorcalls.com/
http://www.yellerdogcalls.com/predator-calls.html
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