Carefully using a knife cut away at the heat shrink on the laser exit side of the tube.
Remove the heat shrink.
Carefully unscrew the heat sink from the laser tube
Be careful not to scratch/damage the lens on the end of the tube.
Take the beam aligner and screw it onto the end of the tube, just like the heat sink.
Connect it up to the power cord and install the tube in the machine.
remove the cover
insert a m3 screw into the center thread, this will be used to move the red dot to align it with the CO2 beam.
slightly lossen the 4 screws which clamp the reddot so you can move around the centre screw with a little force but not so much its no longer held firm.
Connect the alignment laser to the smoothieboards 3.3v and GND pins (Red is 3.3v Blue is GND)
Now turn the machine on and adjust the red dot laser so it comes out of the laser head / nozzle.