Well, first of all - its better to have someone show you, than tell you.
If you have meters at work, ask someone to show you how to make a resistance measurement.
Having said that, basically, you put the meters "selector" switch on "ohms". This will, more than likely, be represented by the omega symbol rather than saying "ohms" per se. Especially if its a newer digital meter. Then, just take the two leads, red and black, and hold them against the green and black wires of the pup. Make sure the red and white wires of the pup are shorted together, (if its a 4-conductor pup), and also, make sure you don't hold the probes against the pup wires with your fingers. The resistance through your hands could throw off the reading.
Then, read the value from the meter, making sure to note what "Range" the meter is on. You'll probably see a small "k" somewhere in the display.
