You have a <div class=”menu”>. I assume this is what you want to remove. You could remove that entire div and any code inside of it. It is most likely located in your header.php. If you can not find it or do not want to actually remove the code you could go into your style.css and add the following
.menu {
display: none;
}
If you do decide to go this route do realize that the navigation will still load it will just not display. So if you are worried about memory or page speed you would want to actually remove the menu.
