Changing Logo is very easy. You just need to replace default logo with your own logo image.
- Replace the logo.png file with your own logo image.
- logo.png file is located in the theme folder (berry)
- Name of the logo image must be logo.png
Logo is not showing
If you site is not showing your custom logo or the theme default logo, make sure logo is enabled in the theme settings.
Navigate to: Home >> Administration >> Appearance >> Settings (of berry theme) and enable logo.
admin/appearance/settings/berry