How to add a collaborator on Box.net Select the Contacts tab Click on Add Collaborators Enter email address and select which folder you wish to share Select Access Type and enter Folder Description Click Invite. How to add a collaborator on Box.net. 1  Select the Contacts tab. 2  Click on Add Collaborators.3  Enter email address and select which folder you wish to share. 4  Select Access Type and enter Folder Description. 5  Click Invite.ow to add a collaborator on Box.net. 1  Select the Contacts tab. 2  Click on Add Collaborators. 3  Enter email address and select which folder you wish to share.