Zotero is made up of three components:
Once Zotero is installed look out for the Zotero icon on the top right side of your browser. The icon changes according to the type of source (reference) you are dealing with (e.g. article, book, website etc.)
A (free) Zotero account allows 300MB cloud storage. Follow the steps below.
Step 1: Go to Zotero.org and log in/register (new account) to activate cloud storage
Step 2: This takes you to the user registration page. Complete the form and click 'Register'.
Step 3: You receive a confirmation email once your account is set up.
Step 4: Click on the confirmation link in the email.