Adding Logo - automatically

I've poured through this forum concerning having your logo, rather than text, display at the top of the mobile screen, and, while there are self-programming options being shared, it would be nice (for us non-programmers) to have this available as an automatic feature. And, while I don't really want to use my regular website's header image, it would be great if we could manually type in a url to our logo. 

Thanks!

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