To manage your member types, go to Financial > Dues Process > 1. Member Types in the menu. There, you'll see a screen like this:
Each member type should be given a name and a total amount of annual dues, including per capita. You can use this form to add new member types, edit existing member types and delete unused member types. You can also report a list of members by member type.
Note: Changing a member type's dues after the dues have been setup for the year will not have an effect until the next time dues are setup.