Validating Your Email
All entries need to be linked to an Email Address that belongs to you. It is for this reason that all Email Addresses are validated.
If your Project 5000 Username is a valid email address then you are already validated.
If you are accessing the system for the first time you will be sent an email with a link that will validate the Email Address. An Email Address is only validated once and will remain validated on your return visit even if it is to place an entry for a different competition.