WordPress header won't go away

At the top of the page of my site (http://www.mindlum.com), there’s a header or bar that has a WordPress Logo (WP) containing a dropdown menu. It also contains a Login. Both of these are in the top left. In the top right of the header bar is a search engine. All three of these are annoying – in other words, the entire header bar. How do I rid myself of it?

Please do not respond (even if you are from the HB-Theme staff) unless you understand CSS coding and are proficient in WordPress site building. I had one gentleman, from HB Themes nonetheless, who responded to my question who said that I should destroy all my work by deleting my third party plugins to resolve this. That’s like cutting off your head to get rid of your acne. I am amazed at how many are employed as help desk assistants who really don’t understand the technology. I hope HB Themes staff can resolve this question, but if they are incapable (after selling me their theme), I will take this question to an outside forum where people know the technology.

I do appreciate any assistance you can provide. I have no doubt that there is someone out there who is schooled in CSS, HighEnd, and WordPress.

Thanks!!