The moon is generally big enough to not need a finder scope. In general, The easiest way to aim a telescope directly at something is to look parallel to the telescope, right above the edge. If you can just see the object you are aiming at, it should be at least visible in the finder scope (if properly configured, see below). In the case of the moon, try to make just the top half visible when looking parallel to your telescope.
If you are having trouble using a finder scope, it might not be properly aligned. A finder scope has two wires forming a cross. A properly aligned finder scope will have an object in the middle of the telescope's view if it is exactly on the cross of the wires. If this is not the case, the position of the wires can be adjusted using the screws. This is best done at daytime by aiming the telescope at a recognizable landmark (somewhat) nearby, such as a tower.