Not sure what a DB25 connector is

Just call me thick, but I have fitted and wired the micro switches and followed the set up instructions and also watched a utube video of how to configure them as limit and home switches, but it is not operating on the switches.
I got to the part where it says go to the diagnostic page and the three home led's should light up when the switches are operated, they are on permanent and do not even go off when the switch is operated. I have played about with the settings to no avail.
I have tried setting X to pin 10 and Y to pin 11 and Z to pin 12 in configuration that makes no difference so have set them back to pin 10 as per the manual.
I have control of X Y Z on the keyboard so I know that is working
What am I doing wrong?