Starting at one side of the garage door attach the seal to the door bottom using one nail or screw at a time depending on whether your door is wooden or metal.
How to install bottom garage door seal on metal door.
Tips on replacing your garage door bottom seal.
Install the new seal with the larger sloped edge to the outside of the garage door and the flat part against the bottom of the door.
In this video we add a new aluminium retainer and new rubber seal.
Thread the t shaped edges into the weather seal track then slide the seal across the door.
Be patient it takes a lot of pushing and pulling even with a helper.
He also gives a brief description.
Make sure you have the right weather seal for the retainer the retainer is the metal strip on the bottom of the garage door that has a track for the weather seal.