How To Apply Frontline On A Long Haired Cat And Will It Hurt If I Put It On Early?

When I had originally put frontline on my kitten I did it wrong because his hair is so long that you can't even get to his scalp and we kinda rubbed it around in a big circle instead of just letting it sit in one spot. He's been scartching a lot and I'm not supposed to put it on again until the 20th. So can I put it on early and how can I get to his scalp since his hair is so long!?

Part his hair until you can see the skin, then put the nozzle thing down just above it.  Squeeze, then rub it in using the applicator on his skin in a small circle.  I'd wait until the 20th to reapply.