Search Form is built-in - can't remove it?

Question

WordPress

Help plz. I am newbie. I made a website on the BA Hotel theme, everything is ok. There is a problem, the search form for booking is fixed on the header. She, I do not need because, the English version, people will not understand.
I tried through the theme settings, the appearance of the theme, the widget menu. Don't hide.
Probably it is necessary to rewrite in the code.
Advise how to be. It's not a matter of changing the subject. And the booking engine search form should be removed