Header.php File Error (Urgent)

I believe I am using the most up-to-date version of wordpress.

So I wanted to remove the search bar in my header area on my website. So I tried to delete the search bar code in the header.php file. I most have deleted the wrong code because when I went to my site I had an error in the HTML file. I try to go back to fix the error because I copied the code I deleted, but to no avail. I cannot even edit my site, nor can I get on it. I am using FushionTheme from ElegantThemes if that helps. I tried to reset the header.php file but I do not know how, nor do I know how to delete to hopefully have wordpress generate a new one. Right now, I cannot get onto my site, TheLoneTree. Please, if you have any idea at all how to fix this it would be greatly appreciated if you could share it with me.