What happens next in this paragraph?

How to install plantation shutters
Put the frame together.
Each shutter frame should come in four pieces. To put them together, use the plastic connectors which should have come with the shutters and gently tap the connector into the coinciding slit in the frame pieces using a rubber mallet.
Choices: a. Screw the frame together using the flat, round edge of a reciprocating saw blade. Be careful not to press against the shutter faces as you will be cutting in three-quarter inch circles.; b. Make sure your frame is even-the left and right sides should be connected to the top and bottom sides. Pieces should most likely be labeled, making this easy.; c. Usually, this will stop a shutters from swinging back and forth in a 90 degree rotation. You can use your own frame, or purchase custom frames from a hardware store.; d. Make sure the dust covers any holes in the shutter down along the sides of the frame and under the film so as not to mess. Fill the frames with plastic film, fill the edges between the metal panels with primer and shake the primer slightly to get the surface coated.;
b.