To collaborate more effectively you should take these 3 steps:
1 Click on the gear button in the top right corner to go to the Settings page
2 Click on the Users tab
3 Type your colleague's email to the "Invite a new user" form and click the "Send invite" button
Once a user receives an invitation in their email box - he should open the email, click the link, and create his account which will instantly become a member of your ProdCamp workspace.