Download AND install the Chrome Connector extension
Installing the Chrome Connector will enable you to save citations to web content directly to Zotero. If you don’t use Chrome, then click the link for "Connectors for other browsers."
https://www.zotero.org/download/
Pin the Zotero app to your taskbar for easier access later.
Further installation details are here:
Although you do not need to have a Zotero account, it is helpful if you wish to access your Zotero collections when you are using different computers (i.e.sync across devices). In addition, if you wish to use the Zotero Group options and / or share your collections, you will need to create an account. Note that the web version has less functionality than the desktop app.
Note that the desktop app and the web version of Zotero look slightly different.
*Credit to Milner Library, Illinois State University for sharing these directions.
When you initially Create Your Account, you will have been asked to "sync" your account across devices.
If you missed this step in the initial set-up, you can add the sync option by going to Edit -> Preferences -> Sync