HCA: Hermit Crab Association

I've read a bunch of places on here that kelp is very good for crabs. So I went to whole foods and bought low temperature dried organic kelp made by Maine Coast Sea Vegetables. I can't seem to find anywhere how do I safely feed this? Rinse it off? Cooked? Raw? Thank you to anyone who can help

You can just crumble a bit into their food or grind some down to powder to sprinkle over fresh fruits and veggies.

I like to feed it with something they love like peanut butter, honey, or rice bran.