You are using phpFox version earlier than 4.6.0? Please refer instruction for this article here.

This tutorial will show you how to change the logo on your website.

This assumes you are already logged in as the Admin user and are logged into the AdminCP.

 

If you don't see your logo after clearing the site cache, you should fully clear your browser cache.

If you will use different themes for your site (by using this app ) you will need to load a logo for each theme. This allows you to choose different logos.