Just follow these steps:
1. Log in to www.groupvalet.com (note, this cannot be done in our app).
2. Click the tab that says "My Groups" and scroll to the group in question.
3. Click the button "Go to Group Homepage".
4. On the left side, go to the Directory. It will either be in the Group tab or the Manage tab, depending on your group settings.
5. This will show you everyone in your group. To download the list, click "Download Group List" in the upper right.