When you first access the Membership Module, you will be brought to the Students page. Here you will see a list of the students in the class (including non-registered participants and guests), their registration status, and their block status.
Students are assigned to sections from this page. To assign a student to a section, check the checkbox next to the student and select a section from the "Assign to:" dropdown menu above the student list.
To block a student, click the blue "Block" link next to the student in the Blocked column. Students can subsequently be unblocked by clicking the "Unblock" button (which replaces the Block link).
Additional (non-registered) students may also be added to this page via the "Add Students of Guests" panel on the right side.