Total novice and lost

[routercnc]

Also for info, on the far right is a potentiometer which you can adjust with a screw driver. This will vary the voltage up a or down within a range, depending upon the spec of the supply. This might be set too high for the drivers so you need to check the output with a voltmeter as mentioned above. Assuming this is the right supply for this box then setting it low might be a good start point.

The white lead coming out of the main box is probably the power supply lead, but you need to know which is + and which is -. Is the control box easy to open, might be obvious which is + and - if you are able to peek inside. Might even state the max voltage on the board. Posting a photo of the inside might even show what make the bits are and lead to more detailed help.

You can use 'ring terminals' to make all the connections to the power supply - these crimp onto the end of the cable (remove a bit of the insulation first). Make sure they are good and tight by giving them a pull afterward. You can buy crimping tools to do this.

Once it is all working, obviously the mains terminals are dangerous (!) so you need to decide how to cover these, or place the unit somewhere safe. Mine is inside the overall control box, with a small fan (ignore the date, the camera is faulty):