Zotero Groups allow you to collaborate with other Zotero users. Please note that all persons you are trying to include in your group must have their own Zotero Account. To create a free Zotero account please follow the instructions here: Download Zotero
To create a group in the Zotero application you will first need to select the "New Library" button, in the submenu that opens you will need to select "New Group."
You will be prompted to log into your Zotero Web account. Once logged in you will be able to name your new group as well as set your preferred settings.
Sync Your Libraries
The new group should appear in your Zotero application within a few minutes. If it does not, you can sync your web and application libraries by clicking the green "Sync" button 
in the upper righthand corner of your Zotero Application.
To create a group in Zotero Web you will first need to select the "Groups" button at the top of your Zotero web library.
You will then be prompted to create a group name as well as set your preferred group settings.
Sync Your Libraries
The new group should appear in your Zotero application within a few minutes. If it does not, you can sync your web and application libraries by clicking the green "Sync" button in the upper righthand corner of your Zotero Application.
Once your group has been created you will need to send invitations to your intended collaborators to join the group. To do this you will want to be in your web based Zotero Library. Click on groups in the top of your Zotero Library, this will open a page with all of your groups listed.
You will then want to select "Manage Members" under the group in which you would like to add members.
This will then open a page where you can send invitations to new members/collaborators.
