I can not edit Mega Menu

Firstly, you can find here for the document guide on how to configure the Mega menu of DW Focus 2: 
https://www.designwall.com/guide/dw-focus-2/manual-installation/

Thank you. I solved the problem.
 
But I have never inserted an ad here.
Can I delete this ad?

This is an advertisement.
Is it supposed to be blank here, is not it?

To resolve this issue, you can add the following code to the style.css file: 

.site-navigation .site-navigation-inner .site-navigation-menu>ul.main-menu>li.main-item>.sub-menu .mega-desc center {
    display: none;
}