Ohh, ok. We didn't knew that this is what you meant. We thought that you know why it's not clickable and you are working on it. Anyway, search is not clickable because of your custom css and is has nothing to do with the BeTheme itself. Just take a look at https://snag.gy/ATRugO.jpg and see the css we mean.
Comments
it's very simple. You have too many menu items and that's why search doesn't look good. To fix it, you need to remove the last menu item.