Private Labeling

Does anyone know the correct syntax for using /v1/settings/ui.pl as per this doc > https://github.com/rancher/ui/tree/master/public/assets/images/logos?

The setting can be any string you want. It will be used in (most) places where Rancher is displayed in the UI.

Thanks Vincent, I am somewhat of a newbie. could you show me an example url?