Separate the circuit wires at the existing splice and loosen the cables as needed to make room for the new junction box. Mount the box to the framing (or other support structure) with screws driven through factory-made holes in the back or side of the box, as applicable.
Electrical wire has very convenient ways of telling you what it is. Most of the coding is standard, so with a little study, you'll be able to figure out what you have to work with. Wiring does not come in a variety of colors to make it look good. No, there is a wire color coding system that applies to most wires in your home. Most importantly, you need to know that the black, red, blue, and yellow wires are hot and green is often the ground.
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