Making header link to home in Arjuna theme

Hi, thanks for reading:)

OK, so I’m using the Arjuna-x theme and want my header to link to home. There’s plenty of posts explaining, but I think the code in Arjuna is slightly altered because I can’t find the right piece of code.
I replaced the ‘lightBlue.jpg’ header with my own and can look up and replace code en understand only very basic html.

So what piece of code do I need to replace in what file (presumably header.php, but i saw style.css referenced in other solutions as well).

Much obliged!

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