You have to enter your suggestion for one of the 6-character codes to be found (12 have already been found, 8 more to go) on the 6 big black rectangles (you can't miss them) by clicking on them, or directly from the keyboard, and AFTER you must enter the captcha and press enter... If it says "wrong", then your 6-character code is not correct, or has already been found... Look at the videos for ideas about codes to find... Like registration plate of the taxi (already found, obviously), for example... 0x4e84