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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. 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. Tap the sides into each connector piece until they are flush against each other. If you're installing your shutters to the interior of your window frame, make sure the window is square and that there aren't any latches, handles, or other things that would get in the way. If you're installing your shutters to the exterior of your window, you'll be attaching the frame directly to the wall. Whether you choose an interior mount or exterior mount will change your necessary measurements, so check your plantation shutter instruction manual to make sure you're doing the right one. An exterior installation works better for bay windows as it provides more mobility. Pick up the frame and place it in your window. If it fits nicely, attach the frame to the window by inserting two screws at the top of the frame using a drill. If your frame has predrilled holes, you can insert the screws into those, but make sure you only attach the top ones. The bottom of the frame should still be able to move freely. It's helpful to have a second person hold the frame to the window while you insert the screws, or vice versa. If your frame isn't fitting, it either means the frame wasn't put together properly or your initial measurements are wrong. Make sure the frame pieces are connected and even. If you think you might have sent in the wrong measurements, call the shutter company and ask for advice. Use a level to check that each side of your shutter frame is even. For an easy installation of the shutter panels, you want to make sure your frame is level before moving on.
Put the frame together. Know whether you're installing an interior or exterior mount. Attach the top of the shutter frame to the window using screws. Use a level to make sure the frame sections are even.