and step one should be make a backup of your desktop library! (THESE MAYBE OLD INSTRUCTIONS AND NO LONGER WORK THIS WAY, July 2017)
see here for slightly more detailed instructions (near bottom of page)
http://libguides.utoledo.edu/endnote/questions
(copying info from U Toledo’s web page here)
EndNote Online Problems
Problem: I cannot enter a library in EndNote X7’s preferences for the purpose of sharing with a group.
Fix: Syncing between your EndNote Desktop and EndNote Online needs to be reset. Make a backup copy of your library before proceeding with the reset process. You may see the following Knowledge Base article for instructions:http://endnote.com/kb/82295.
Next, delete all the references and groups from your EndNote online account. See the below links for instructions:
- http://www.myendnoteweb.com/help/en_us/ENW/hsr_delete.htm
- http://www.myendnoteweb.com/help/en_us/ENW/hsg_deletegroup.htm
Now do the following:
- In EndNote X7, click on the Edit menu and select Preferences. Uncheck “Sync Automatically”. Restart EndNote.
- Empty the trash on both your desktop library and online library.
- Go to Edit > Preferences , click on Sync and add the following to your E-mail address under EndNote Web Account Credentials: #!resetLocalSync
This should then read as: firstname.lastname@utoledo.edu#!resetLocalSync. Click Save and close the Preferences screen. - Click on the Tools menu and select Sync.
- EndNote will then appear to authenticate and return the prompt: “A Sync library can be linked to only one account. Do not proceed unless you intend to break the link to the original account.” This happens because EndNote has been tricked into thinking it authenticated against another user. Click OK , and EndNote will purge any knowledge of a previous sync.
- EndNote will then display a message, “Your local sync state has been reset. Please re-enter your E-Mail Address, restart EndNote, and Sync again.”
- Restart EndNote and open the copy of your library that has the full set of references.
- Go back to EndNote > Preferences and go to Sync.
- Enter the correct user/pass in and set up the automatic sync settings to meet your needs. The E-mail address should be reset back to: firstname.lastname@utoledo.edu
- Save and Close the Preferences.
- When you click Sync again, you will once more get the message “A Sync library can be linked to only one account. Do not proceed unless you intend to break the link to the original account.” Click OK.
- You will be prompted to make a backup of your library. You can create another backup of your library at this point. A complete Sync will then begin.