To help you add citations and bibliographies to your writing, Zotero automatically installs a word processor plugin. It adds a toolbar or buttons to Microsoft Word and LibreOffice.
In Word it looks like this:
Mac users can find Zotero options under a toolbar or the Script menu.
In LibreOffice Writer, the Zotero options are in the main toolbar. They are the buttons with the Zs on them. If they don't appear, go to View > Toolbars and make sure the Zotero option is checked on.
If you just installed Zotero and it's not working, make sure you close and restart the word processor. That has to happen for the plugin to be recognized and start working.
If you need to reinstall the plugin, follow Zotero's instructions on the page about word processor plugins.
Use the following steps to cite as you write using the Zotero plugin:
Use the Add/Edit Citation button to edit or remove a citation you've already added.
If you are uncertain of the title or author of the item you wish to cite, use the small arrow beside the Z in the insert bar to access Classic View, which will allow you to browse Zotero using its standard interface and see more options.
With your citations you may want to create a bibliography:
If you need to change the citation style, use the Document Preferences (Word) or Set Document Preferences (LibreOffice) button.