This Quick Start guide gives you information on Zotero in a nutshell!
After you've downloaded Zotero and the extension, you need to make an account. It's easy to create an account with Zotero. Just go to the homepage at www.zotero.org and register.
It is important to link your Zotero account to the download version of Zotero and set up the Sync function. This will allow you to keep all your Zotero libraries, online or on multiple devices synced.
To do this:
Open the Zotero app and on Mac, choose Zotero/Preferences from the main menu. On Windows, choose Tools/Options from the menu. Then select the sync tab.
Put in your username and password. If you have not already you can create an account on this page