If you are using the standard desktop image, you should be able to start the sync client by going into the applications folder and opening the owncloud application. If you are installing it on a machine you manage, you should be able to obtain the sync client from this link.

1. Start up the sync client, and type "https://chembox.ch.cam.ac.uk" as the Server Address
   
2. Enter your Admitto credentials.
   
3. Select a local folder to synchronize
   
4. Success!