Ok, so put dip 2 to on, switch on the marker and all the lights will run through a colour sequence.
When it stops, pull the trigger once and the colour will change, pull it again and it will change... keep doing it until you hit yellow.
When you're in yellow, pull the trigger and hold it, count the yellow flashes and then when it stops pull it 3 times (provided I'm right that 3 is for Mill) and then flick the dip switch back.
You should be good to go if you're already in 10.5bps