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

In Neutron 4.4 and up, you can set the site default cover photos for pages, groups, and profiles.

Hover over your default theme and click Edit (be sure not to be editing the default bootstrap theme though)

phpFox 4 User Manual > Changing Your Site's Logo > edit theme.jpg

Once in the edit screen of your custom theme, choose Default Photo in the left menu links

phpFox 4 User Manual > Setting Default Profile, Pages and Groups Cover Photos > theme default photo1.png

phpFox 4 User Manual > Setting Default Profile, Pages and Groups Cover Photos > theme default cover2.png