Step 1: Splice EL wire
Then you just splice the two colored EL wire. I have 3 feet of lime green and 3 feet of blue EL wire. Solder the Angel wires (and their copper solder ring that I attached) of each EL wire to each other. And solder the copper core of each EL wire to each other.
Pictures of the other components are somewhat shown in the next step (the inverter and power source and a switch). These will have to be soldered in line with the EL wire.
EL wire - Switch - Inverter - Power supply
I don't think the polarity of the EL wire matters. But the polarity of the power supply to the inverter DOES matter. Down circuit of the inverter, you can choose any wire to be positive or negative... (but be consistent)