The answer to 'how to install drip edge' is to properly install drip edge along the edges of your roof to prevent water damage. Drip edge is a metal flashing that is installed along the edges of the roof to direct water away from the fascia and into the gutters. This helps protect the roof and home from water damage.
To install drip edge, first measure the length of the roof edges where you'll be installing it. Cut the drip edge to size using tin snips or a chop saw. Apply a bead of roof sealant to the top of the fascia board, then position the drip edge and secure it with roofing nails every 12 inches. Overlap the drip edge pieces by 2-3 inches where they meet. Finally, apply roof sealant along the top edge of the drip edge to create a watertight seal.