just click the numbers to change them, try to match them up with the code on the lock, after you match it, click the shackle (metal ring on top) you can also try doing it without matching the codes but it wont budge update: puzzle mode, press space to activate. 'code' is the code in order, but encoded. you can use the translation key to decode it. note: every translation key number is upped by 1, so 1 will actually be 0 and so on. some translation key entries will be unknown, you need to press F to make a free guess and enter the number of the unknown entry + 1, as usual.
