you have to take the motorcycle temps test at the bmv testing center (no appointment needed)
my advice... get there, skim through the motorcycle pamphlet they have (a few good points about bikes you probably wouldn't know) and take the test.
from there you can take the Motorcycle safety class (which is sadly full until september), or schedule an appointment with you bmv to take a skills test. (You won't want to do that until you are pretty good at low speed maneuvers cause that is all the test is)