Set the spline over the screening, aligning it with the groove in the frame. Start at one corner and, using the concave wheel of the spline tool, gently press the spline and screen into the frame ...

The kit I bought off Amazon came with the screen, spline that holds the screen in, a roller tool to push the spline in, plus a little utility knife and tape measure.

Place the screen over the opening, then begin pushing the spline into the groove along one side of the frame using the screen roller tool.

If your doggy pushed through your screen door and turned it into his own doggy door, this is for you: Replace your screen with some elbow grease and $20 worth of supplies.

A screwdriver or similarly small tool is helpful to pry up a little bit so you can firmly grasp it and pull. Discard the old screen and spline.