If you need to remove a member from a subject:
- Click the Manage members button at the top right
- Click on the cog icon at the right of the selected member
- Select Remove from this subject
If needed you can search for a specific member.
You can also:
- remove a subject's guest from the Guests tab
- cancel an (unaccepted) invitation from the Pending tab
- resend an (unaccepted) invitation from the Pending tab