change logo in Drupal themes

ciboss

I would like to use my own logo in the header of my new drupal-based website.
Unfortunately, every image I want to upload to the Garland-theme of any other theme is changed in a red cross, and the properties of that image show me still the name of the garland-logo.
Can somebody help me to upload my own logo.jpg?
Is there any limit on pixels or kB ?
Thanks for your help.
Very Happy

devotchka

Try replacing the default theme logo(located in /themes/garland/) with your own logo(rename it with the same name instead of uploading through Drupal).

ciboss

thanks
it perfectly works
Very Happy