I recently bought a Stewart ElectriScreens. I don't know how to operate the Tab-Guy tension function, to ensure that the screen does not curl. I cannot seem to find any in the manual about this and I don't want to make any errors trying. I can see is that there is a screw located at the frame bottom in each side. But should I just turn these screws clockwise/counter clockwise to make the tension tighter? Or is there another way to do it?