You can log in with the username and password that you created when you created your user account.
Before you can start using Viewpoint For Projects™, a current user must email you an invitation. Once you have received the invitation, click on the link to accept the invitation and create a user account.
If this is your first time logging in, you need to create an account by accepting an invitation. If you have not yet received an invitation, please contact the project administrator.
Follow the simple prompt at login to validate and link your account(s) to an email address, and set a new password of sufficient complexity. For more information, see here.