Is there a way I can retrieve my PIN code used to lock my MacBook Air via iCloud though my Apple ID?
I just can't seem to remember the code and need to unlock it but can't seem to find the correct Apple resource.
The easiest way would be to take your Air to the Apple store. They will do it for you.
If you want to hack it yourself, here is a tutorial: How to: Unlock System Lock PIN Code - MacRumors Forums