Select the appropriate browser extension (Safari, Chrome, or Firefox)
Follow the instructions to add the extension. You may need to restart your browser afterwards
When the extension is installed an icon will appear next to the address bar of your browser:
Word Processor Plugin
What are word processor plugins?
Word processor plugins let your word processor (MS Word, LibreOffice/OpenOffice/NeoOffice) communicate with your Zotero library while your write, allowing you to quickly insert citations into your document and automatically generate a bibliography.