Follow these instructions to apply FRONTLINE for cats.

To apply, simply follow these instructions–and repeat every 30 days:

Remove Applicator: Lift and remove the plastic tab to expose foil backing. Then peel away the foil. Or use scissors to open

Open Applicator: Hold upright with foil side toward you and snap applicator tip

Apply FRONTLINE: Part your cat's hair between the shoulder blades. Place the applicator tip just above the skin and squeeze. Apply entire contents of the applicator in a single spot directly onto the animal's skin. Do not apply on top of the haircoat. Avoid contact with treated area until dry

Here are some additional tips.
Remove the cat's collar
Apply as a spot between your cat's shoulder blades in 1 area that can't be licked
Avoid touching the wet application spot
Wait 48 hours to allow solution to dry before bathing or letting your cat get wet
Give each of your cats its own complete dose