Once you are registered as a travel agency and have received your confirmation email, you will be able to manage your travel agency by accessing your User Profile. The user ID box can be found in the top-right corner of your screen. All you'll have to do is enter your username and password as indicated in your registration.
If you have forgotten your password, you can use the option Forgot your password? shown in the user ID box. Enter your email and you will receive instructions on how to recover your password.