I don't know what to look for in your specific blower motor problem, perhaps someone else can help with that, but thats the same DMM I keep in my truck. here's some basics to help you get used to using it, sorry if they're really basic, I don't know how familliar you are with electicity or using a multimeter. the settings you'll use mostly are going to be the DCV (DC voltage), and the Ohms (omega symbol, its a measurement of resistance). plug the red probe into the far right red circled port, and the black probe into the middle non-red circled port. remember that your black probe is the ground. so if you're probing around for wires looking for a positive signal, you can find a good ground for the black probe and poke around with the red one to see what voltage you're getting. if you're unfamiliar with how to use it, you can practice on various stuff, like probing the battery using the DCV setting, try it with the truck off, and again with the truck on, you can monitor your alternator output, verify that the dash voltage gauge is correct, etc. something else you can check is the resistance of wires and such to look for problems. like when I get new spark plug wires, I always check their ohms. just set the DMM to the ohm setting (the omega symbol), and put one probe on one end of the plug wire, and the other probe on the other end, and read the amout of resistance each plug wire has, you want them to be in the same ballpark (they're not going to be identical), but one wire with a really high impedence is a sign of a bad wire. one thing to note if you're using the ohm setting, is if you look at the top of the display, you'll see a K, an M, and an ohm symbol, so if you're probing something, if just the ohm symbol is on, then the number is just ohms, if the K and the ohm symbol is on, then the display number is kilohms (i.e. 10^3 ohms), and if the M and ohm symbol are on, then the display number is megaohms (10^6 ohms)... hope thats not too simplistic, and that it helps. if you have questions feel free to ask
oh and BTW, when people are new to using DMM's I've seen one issue that may cause a faulty reading, when you're using the probes, don't touch the metal parts of the tip (just hold on to the plastic casing of the probe), you conduct electricity too, it's probably not going to shock you or anything, but it could cause faulty readings.