Thank you for contacting Telerik Support.
In order to change the image for the backend login you need to apply a custom theme for the backend. You can find one in the Education Starter Kit
- review the sample images to get a better idea,download it and inside you can find the CSS for the customized BackenTheme which you can modify to create your custom one.
You should then register it in Sitefinity on ~/Sitefinity/Administration/Settings/Advanced >> Appearance >> Backend themes
and then you create new theme by clicking on the Create New
it let's say CustomTheme and in Path
give the path where you put your modified CSS. One you've saved the changes go back to ~/Sitefinity/Administration/Settings/Advanced >> Appearance
and in the BackendTheme
textbox fill in the name of your custom theme (e.g. CustomTheme)
I hope this information helps. Please let me know if I can assist you any further with this service request. Thank you in advance.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items