Most do-it-yourself lighting projects using rope lights require the lights to be cut to custom lengths. The lights can be cut only at precise intervals -- which vary according to the type of lights you are using -- typically every 18, 24, 36 or 39 inches.
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Locate the nearest cutting mark, typically indicated by a dotted line or scissor icon, according to the length of light you need. Look for two small wires on either side of the cutting mark, making sure the cut is in between each of them, either on the line or right next to it.
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Use a utility knife, wire cutters or scissors to make a clean, straight cut through the rope light.
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Attach the power connector to the power cord by inserting the two pins on the connector into the two holes on the cord. Secure the two pieces by threading the attached collar in place.
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Open the attached plastic flanges or separate the screw compression cover on the power connector, depending on its design. Slide the cover or plastic nut onto the rope light and line up the pins on the connector to the wires inside the rope light. Slide the pins gently into the wire holes on the light, making sure the wires connect with the pins.
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Plug the power cord into a standard wall outlet briefly to make sure the pins and wires are connecting. Unplug the cord and screw the cover or nut in place to secure the power cord to the light.
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Place the end cap on the other end of the rope light to seal off the wire holes. Plug the power cord back into the wall outlet.