If you have forgotten your username, you can recover it if you know the email address(es) you used with RD.Construct. On the login page, click on the ‘FORGOT USERNAME?’ option:
You will then see a box where you can enter the email address you used:
Click the ‘BEGIN >>’ button, and, assuming your email exists in the database you will receive an email at that address which lists the username(s) associated with that email.