Forum:Changing the logo top left

How do you change the logo on the top left of a wikia? I haven't been able to find it in the help section. I know it was the subject of one of the first questions on this forum. Have old answers been archived somewhere Dr Joe Kiff 19:42, 12 November 2007 (UTC)
 * For Quartz upload Wiki wide.png
 * For MonoBook upload Wiki.png

Cheers! --Charitwo

Didn't work
I tried uploading Wiki.png, but the logo stays the same. I'm using Norwegian wikia, so things are of course translated. Also there's a discrepancy on the help pages. On the front page it says the image cannot be larger than 135x155, but on the "fine print" it says it cannot be larger than 155x155. Now I've tried both, and both do not work... What am I doing wrong? --Kebman 15:25, October 21, 2009 (UTC)