Follow the guide below to remove users from a group within your SharePoint site. This does not remove them from the SharePoint site.
If you would like to remove a user from the whole SharePoint site, follow this guide: Remove Owners and Members from a SharePoint Site
Navigate to s.uconn.edu/sharepoint and click on your SharePoint site.
Click the Settings gear icon in the upper right. It may take a moment for this icon to load.
Click Site Permissions.
Click Advanced permissions settings.
Click on the group in which you would like to remove users.
Check the checkboxes of those you want to remove.
Click Actions and Remove Users from Group.