You can remove Perch branding from the Control Panel, rename the perch folder and even add your own UI customizations.
Many Perchers like to customize the Perch Control Panel, either to match the website it is managing or to create a Control Panel theme based around their design agency branding. There are lots of ways to do this.
At a simple level you can upload your own logo and change the colour scheme used in the Control Panel. You can also turn off the Perch and edgeofmyseat.com branding in the Settings.