All users of the site whatever your role is (editor, developer, etc.), must register or use an existing github account to be added as a collaborator.

How to activate or enable / add a collaborator account?

• 1Login with your account in app.webriq.com/auth/login
• 2Once you're authenticated, click Manage Sites
• 3In the Site Management Tab, select a site from the list and click the   Manage action button
• 4 Login with your existing github account or register a new one.
• 5 In the github authorization application window click Authorized Application button.
• 6 Once authorization has been succeeded you will be ask to login to your site. Simply click the Login button.
• 7 Second Authorization window from github will appear asking a permission to allow access to the site. Click the Authorize Application
• 8 Once successful you will be redirected to your site /dashboard. Congratulations!