After you've logged in to the phpRaid site, you'll need to create a character again.
Go to the "Create" dropdown menu on the far right, and select "Character"
Enter all of the pertinent information into the prompts.
Go to the raid calendar to sign up for individual raids. Select the appropriate character, then the class type (Tank, DPS, Healer, etc), and your raid status.
If anyone has any questions, let either Maruda or Heim know. Thanks!