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My bad.
You just rub it on the strop, like a crayon.
I'd highly recommend that you look in the library here. Everything you want to know on the subject is there, its a bit much for me to explain...

Cut a small hole, in the toe end of a over the knee tube sock.
Put the sock over the strop, so the ring you hang it from, comes thru the hole in the sock. Then hang it on the back of a door or...