How to add image with hyperlink at the top of my homepage?

Hello everyone. I want to add an image containing my Twitter account at the top of my homepage. I tried doing this with the header image but apparently it’s not that simple. When you open my site or any site, there’s the site title, then under it is the tagline. I want to add an image with a hyperlink under the tagline preferably, or at least somewhere in the top. Is there an easy to do this?

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