Right email ID and username are like right real estate properties .I would advise you to claim your preferred identity before anyone else go for it.Step1:
Log on to your facebook account.
Step 2:
Select your preferred username or you can go for suggestions from facebook.If you have already created username skip this step.
Step 3:
Once you get you username go to following link:
It will prompt you to request an invitation. click on it.
Step 4:
Once you have requested for invitation you are in que. And facebook will send you a message confirming that your facebook email id is created .
Be careful in selecting your username because your facebook email ID is going to be username@facebook.com
once you have your facebook email ID you can start using it on your collaterals.
once you have your facebook email ID you can start using it on your collaterals.