Hey Natalia,

The trick is to "force" the mobile navigation to appear by making the #mainNavWrapper large enough.

#header #mainNavWrapper {
 position: relative;
 z-index: 1000;
 width: 3600px;
}

This can be entered in Design / Custom CSS.

Found the answer here if you need more information: http://answers.squarespace.com/questions/35784/bedford-how-to-force-mobile-navigation-icon-hamburger-at-all-times

Thanks @oemartinez, this worked perfectly! I used:

mainNavWrapper { width: 3600px }

and it seems to have worked. Thanks so much!

Can I get a code like this for Marta template???