If your new to Orbiter, try getting into orbit first. If your not, heres a brief Overview:
Launch into orbit
Using AlignMFD, set target to moon, Burn Orbit-Normal (+) or Orbit-Normal(-) When it tells you to
Then, use the Transfer MFD, set target to moon, click HTO, then hold down DV+ until the dotted line intersects the yellow circle, Then, using a combination of EJ+, EJ-, DV+, and DV-, try to get the gray line to coinside with the yellow dotted line.
When thats done, wait until Tn is 30. Burn prograde till Tn is 0, then press Kill-rot (to turn off prograde). Burn until Dv on the TransferMFD is 0. Then you are on your way to the moon.
Have Fun!
EDIT:
Darn, you beat me to it