Adding icons to Betheme header

Hi there,
First time poster with a basic question. I am trying to add an icon to my my sites theme header.
The page format I have doesn’t seem to allow it. Does any one have any suggestions on how to do this?
Approx position of icon is the red box. I note on the theme editor there is an application that allows you to customise your own CSS, which I have not done yet.

Thanks in advance.

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