The Thayer School Group Manager is a tool that allows you to grant privileges to your ThayerFS folders, FileMaker databases, email lists, et cetera.
The Group Manager tool is available here: http://computing.thayer.dartmouth.edu/tools/groups/
To use the tool, you'll need to have Computing Services designate you as an admin for a group.
Below is a screencast demonstrating how to use the tool.
When adding new people to a group, it may be necessary for them to log out and back into a service, such as ThayerFS or the wiki, to get the updated permissions.