It is important to create an online account with Zotero. The online account allows you to:
On Zotero home page, click Register, enter a username, an email address and a password. Confirm your account by clicking on the link in the email sent by Zotero.
Login to your online account, click Settings on the top.
There is no limit on the number of references syncing with an online library.
Use Groups to share references with others.
You can set up groups for public or private memberships. This will allow you to share references with other Zotero users.
The groups you shared with others or the groups you joined also show up in Zotero Standalone:
You are responsible for using and sharing copyrighted information!