Dry the panel and trace the outline of the frame onto the panel. This will show you where to spread the glue. A plastic puddy know works great for spreading glue. The glue peals of the puddy knife once dry.
I've applied the glue to the back of the frame and need to spread the glue BEFORE attaching the plywood. Very important step when gluing plywood or any wood for that matter. Spread the glue so you have 100% coverage of the area being glued.