ACCOUNT: LOGIN User Name: Password: Forgot your password? After you "Signup" (T-Square) - your Account and Plan Room have been created with addenda.org. The next thing to do is access your account to post projects and files to your Plan Room. Once you access your account you can edit your profile, change your password, edit existing projects name and discription, add addendum and/or files to an existing project, or add new projects to your Plan Room.