how to switch account
I used on computer from another person. She left the office but when I opened the Zotero, I could not upload my library but always saw hers.
What can I do now, I want to use my own library saved online but not hers.
What can I do now, I want to use my own library saved online but not hers.
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http://support.mozilla.com/en-US/kb/Managing%20profiles
If you really don't want to do that (though I can't emphasize enough how much I'd recommend this), you can just back-up the zotero folder (just make a copy of it and put it somewhere else) and then delete it.
http://www.zotero.org/support/zotero_data
Regardless of which of the two solutions you pick Zotero will then create a fresh, empty library. After putting in your user data in the sync panel of the preferences you can then use sync to populate it with your online data.