Question: why is zotero not showing in word?
Answer: If the Zotero option doesn't show up in that menu, try reinstalling the Word plugin from Zotero. In Zotero, go to the Cite → Word Processors pane of the Zotero preferences, click the “Reinstall Microsoft Word Add-in” button, and then restart Word. If you get an error, report it in the Zotero Forums with a Report ID.