When you sign up for PhotoCircle Essentials, any Circles you created become property of your Workspace (rather than your individual account) and are then can be both viewed and managed PhotoCircle for Web.
Any Circles you are only a member of (but did not create and therefore do not own) will be viewable on the web, but you will not be able to upload media, edit the title, or perform other Circle management tasks from PhotoCircle for Web.
If there is a Circle that should be transferred to your Workspace, please have the Circle Creator email support@photocircleapp.com to request transfer of the Circle.