People can be enrolled in a class from either the Person Editor or from the Training Courses in the Setup menu.
From the Person Editor, select Training on the left margin and follow the menus out to select a course you are offering.
From the Training course setup, right-click on any course and select See the course's registrants. From there use either the Enroll a person link or the Find people to enroll link.
Only the registrant statuses Complete, Registered, Pending, Failed, Unconfirmed, Waitlist and Incomplete count against a course's enrollment capacity as you have defined it in the course properties. If you want to change the Status This training record Pack waitlistTools