Alrighty then.
The riddle: I am a builder, yet I'm unlike you. I am... Beaver
I think if I add more clues i would be simple... A, B and R were found out by LioNeeZ.
Hinode gave the correct answer.
The system have promoted you internally. You can now add a simple signature. It will take a while for you to rank up to be able to customize further such as adding a user banner, adding a signature images, customize font and so on.