An administrator can do this by navigating to the Settings page and clicking on Branding.
There he can change the logo (450 X 50 pixels) with his own logo. Also the publisher name can be changed. This is the name that will be visible as publisher in Intune.
Note for partners:
When you have customers connected as an MSP, you can set your logo for all your customers at once from your portal. If customers have access to their own Scappman environment, then they can overwrite your logo by changing or resetting it.