Download Zotero from the website https://www.zotero.org/download/. You can also download the Zotero Connector for Chrome as well as for Firefox from the same website. First, download the software for your operating systems e.g. Windows (PC) or Mac. Second, while using Firefox/Chrome, install the connector from the website https://www.zotero.org/download/.
The website https://www.zotero.org/support/word_processor_plugin_manual_installation includes instructions on installing the Zotero add-on to Word.
Lastly, Zotero does have a quick start guide at (https://www.zotero.org/support/quick_start_guide). Videos on using Zotero are included on the ZSR YouTube channel as well at https://www.youtube.com/watch?list=PLTU8eFl06Wq1pGbaVZrPO8zCRwNN_vrIj&v=cuzXRTBaoAs
A quick start video for the product/database along with additional training/webinars are included below for AccessEngineering, Engineering Workbench, SciFinder-n, and Web of Science.
Web of Science