Thank you for using our services. Can you, please, clarify to which template you are referring - is it a Page template, or you want to change the Sitefinity backend theme?
Also, can you provide some more information regarding the issue you mention concerning the images that you are unable to use in Sitefinity? Could it be related to this KB article
related to images being stored in an Images folder int he root of your SitefinityWebApp?
the Telerik team
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