The memberships manager is a tool for selecting memberships based on a set of criteria and then editing, deleting, or mailing to those members. Use this to:

Tools
| Create a new membership | Creates a membership for a volunteer of one of the types you have defined. If this link is not working, check that you have at least one membership type set up. | 
| Setup membership types | Takes you to the setup tool for membership types. This is the same tool available on the Setup panel. | 
Filters
| Membership types | Types set up for your organization. | 
| Statuses | Membership statuses - Expired, Active, Cancelled. | 
| Effective between | Date range for when membership is valid. | 
| Expired between | Date range for when the membership expired. | 
| Cancelled between | Date range for when the membership was cancelled. | 
On the right-click menu
Right-click on a membership in the list to modify that membership or perform other actions.
| Add a new membership | Creates a new membership of the type that you select. | 
| Edit membership | Edits the membership. | 
| Edit member | Edits the owner of the membership. | 
| Delete | Deletes/un-deletes this membership. |