Register for a free Zotero account to:

• sync and save up to 300MB of content online
• maintain your Zotero library online and add, edit, and organize citations
• participate in Zotero groups and share references
• participate in Zotero discussion forums

Login into your Zotero account at  https://www.zotero.org/ to view and update your profile and settings, 

Choose Settings > Storage to see how much storage your Zotero library is using,  You can also upgrade to 2GB for $20 oer year, or add more storage for an additional fee.