No worries dude. "... the drugwars game ... which i have actually no idea why i keep playing that ..." LOL I felt the same way I just finally stopped playing a week or two ago and I have no idea why I kept playing for so long, it was so pointless and a total time waste but I just kept doing it for some reason. It felt great to just walk away.
OK as far as changing your keys, go to your steemitwallet and click on the change password:

You will have to put your current owner/master password in and then click to generate new password. Record the new password offline safely in a notepad file or password manager, etc. Then paste in the new password again to confirm that you have it recorded where I drew the arrow. Once you have done that, you will have changed to a NEW master/owner password. This means all your previous lower permission keys (active / posting keys) will no longer work. Once you have the NEW master/owner password, then click on the "keys & permissions" link and use your new master/owner password to generate new active and posting keys. You will have to re-enter the ew posting key into steemit.com to log in once you have done this. Let me know if you have any questions. Cheers :)