Online Documentation for SQL Manager for PostgreSQL
Defining user/group membership
The Member of tab of Role Editor allows you to define user/group membership by selecting the role(s) the user/group will belong to (i.e. to which the user/group will be immediately added as a new member). The selected roles determine the tasks that can be performed through the user or group.
To select a role, you need to move it from the Available roles list to the Selected roles list. Use the buttons or drag-and-drop operations to move the roles from one list to another.