Apply a small amount of spackle to the crack with a putty knife and use the knife to spread the compound down the length of the crack.
Press the tape into the spackling compound before it dries. The paper tape should be specifically designed for drywall reinforcement. Use the putty knife to further smooth out the spackle around and over the tape to prevent lumps from forming.
Add more spackle to the crack once the initial layer has dried until the crack is completely filled.
Sand the repair area with fine-grit sandpaper and a pole sander to smooth out the spackle until it is flush with the wall and the crack is no longer visible.