To remove the files that you have selected for sharing, log on to the web portal with your username and password. Go to My Data. Under My Data at the left menu, click on My Shared Storage icon, it is the third icon of the five icons under My Data. You will see a list of all the files and/or folders that you have selected for sharing. Click on the folder icon of the file that you no longer wish to share, and that will bring you into the File/Folder Sharing page of that particular file or folder. Select "Stop sharing this file" to remove the file or folder from My Shared Storage and click on Update.
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