Question about pellets

I just bought a Pro 22 from Amazon. I'm new to Traeger but not to smoking. I did my first cook, beer can chichen, using Apple pellets. There's a large metal grate thing on the top of my pellet hopper. Near as I can tell, it can't be removed. I wanted to scoop out the Apple pellets that are in there, and use Hickory for my next cook. Is there any way I can remove whatever pellets are in the hopper and replace them with a different blend? I can't imagine having to use the same pellets every time. On my Weber gas grill, I use a smoker box. I change the chips out based on what I'm cooking. Thanks in advance.