You can put the HM into manual mode and then use the button to go up/down in 5% increments. The fan should ramp up from 0% to 100% and the servo should move 0% open to 100% open.
https://github.com/CapnBry/HeaterMeter/wiki/HeaterMeter-Operation
dont pay attention so much to the colors, i make cables all the time and as long as pin to pin are right, color makes no different, hook the cable up to a box and grab pin 3, 4, 5 and wire them to your servo
From what I understand all I need to do is hook up the servo to the ethernet cable. Do I need to do anything else on the board?
To hook up the servo you need 3 wires, gnd, +5v and the servo SPD lead. On the servo Brown is ground, Red is +5V, Orange is SPD
No, not correct, with most standard ethernet cables the orange pair is the first pair and the brown pair is the last. The CENTER FOUR wires are the ones for the blower and servo. Typically the Bl/Bl-Wh are the center two, which are the blower signal and ground, leaving the green pair for the servo PWM and power in addition to sharing the ground from the blower. If you have your CAT5 wire colors in a different order then you will have to figure out the colors on your own.