The heading tags should be used to show the importance of the content that they represent. The tag is therefore the main heading for the page, and the should represent the least important heading. The should therefore show what that page is about, and so should be used for 'settings' in your example.
It is important to note that it all depends on your website though. if you have an article (blog) website you may choose to use the site name. In essence the should reflect what the page is about and where possible shouldn't be duplicated across the site as this may be regarded as keyword stuffing and duplicate content.
I would recommend simply placing the site name in a div, or an h tag with lower promenance ( for instance) and styling accordingly with CSS