Put the 4N25 and the IC socket on the PCB. Connect 4N25's pin 5
and 4049's pin 1 to 5V and 4049's pin 8 to ground.
Get the LED's cathodes toghether and solder a short cable, the
LED's cathode is the lead that is in the middle. Get the LED's anodes of the
same colour toghether, solder a short cable, the anodes are the LED's outter
leads. Heatshrink everything. If you don't know which LED's lead corresponds
each colour, just get a 330 Ohm resistor and put it on the LED's cathode, then
get 5V and ground from your PSU, red and black cable. Connect the black cable to
the other end of the resistor and the red cable to one of the LED's anodes, any
of the LED's outter leads. Take the cables of the anodes and solder to each of
them a 68 Ohm resistor.
Isolate the soldering point with heatshrink.
Solder the resistors at the 4049's input and output.
Solder the cathode's cable to the 4049's pin 8.
The LED's part is finished, this is how they look.