You can delete a member, if required. Click on Board and staff link available in the left sidebar. The sub-links appears as below.
Click on All Members link. The All Members page appears where you can see the list of all members.
Locate the target member in the list.
In Action column, click on View button.
Click on Delete button available in the member details. The backend system asks to confirm if you want to delete this member. Click on Ok to confirm.