Why cannot register?

[Free]

Hi administration,
one my freind is trying to register but couldnt.
Its writing "Wrong registration key" .and can anyone explain .seems like there is no any mistake in profile.

Your friend must have entered the KEY incorrectly. The key sometimes does look fuzzy, and dizzy, and may require the method of trial and improvement before he can successfully register.

[Free]

But he is writing everything right.

[Alouddin]

Free, your friend also has to follow the upper or lower cases of the letters.