I am tring to change the logo in the Effervescence+ theme.

It stands that i need to upload a png file with my logo and then I can select it from the curtain menu. But it only stands this:
Graphic logo - Select a logo (PNG files in the uploaded/images folder) or leave empty for text logo.

Where do i upload the PNG file to? Cant find a directory called that name? And when i uploaded a png file in the right directory will it show itself in the curtain menu then?

That refers to the theme's folder of course.

Did you happen to read the text you quoted? It says "Graphic logo - Select a logo (PNG files in the [b][i]uploaded/images[/i][/b] folder) or leave empty for text logo." So, put them in your installation's [i]uploaded[/i] folder within a folder named [i]images[/i]!

Ah, I did missread that as well....