It's anti-squeal lube that you put on the BACKS of the pad. Just to make sure you don't put it on the braking side - which would be bad.

Changing the pads on Civics takes like 10 minutes per side. Really easy. Just unbolt the lower pin, flip the caliper up, take out the pads, put in new ones, and I usually sand the rotor with some fine sandpaper since rotors and pads always work together. Then put some anti-squeal on the backs of the pads, and press the piston back in with a c-clamp, then lower the caliper and reinstall the pin.

The pin doesn't have to be SUPER tight, just hand tight.