Cipher

i'm done in 17.. hehe.. i save the page. so everytime i type something.. a box is appearing .... username and password.. i remember it.. i think its from level 16.. and i forgot the password.. i just go back to level 1 and start again.. xDD now im stuck in 20.. help me!!!

i dont kmow... i just cant.. how? just a clue please... im stuck!!

guys,, seriously.. i dont understand level 17.. i dont know how.. i dont know where to start.. i hope you can help me.. just a clue.. xD

thank you!!!