The entire design of the administration interface is fully customizable, so it is also possible to change the brand-related logos.
To replace the header logos shown on the top left of CMS Desk or Site Manager, open the App_Themes\Default\Images folder in your Kentico CMS project's directory. The default image files are located inside the Images.zip archive, specifically the Design\Branding subfolder. To override them, manually create the Design\Branding folders outside of the archive directly in the Images directory and then add the replacement files containing your own logos into this location. The names of the files must match the names of the default logos in the archive.
The logon page also contains several images that you may wish to replace. This can be done using the same approach as for the header logos, but in this case the folder path that must be created for the replacement files is Others\LogonForm. You can check the names of the original files in the corresponding directory inside the Images.zip archive.
If you wish to use different image file names or file system paths, you can customize the default stylesheets of the user interface.
These can be found and edited in the project directory, specifically under the App_Themes\Default folder.