Changing the default ‘Select Page’ text in the centered mobile menu of Divi is handled by functions.php. However, placing functions into your child theme functions.php can be a headache. Fortunately, WP has a way to do it.

View the video here, code below, and description in between.

First, kudos to this page (http://code.tutsplus.com/tutorials/a-guide-to-overriding-parent-theme-functions-in-your-child-theme–cms-22623). Rachel MCollin lays out a clear explanation on how this joker works so check out the full page and follow her on twitter. I just did.

The bottom line is that when you just ‘copy and paste’ a function, it breaks your site because the name already exists. It all hinges on load order and conflicting function names. #coding101

Since ET doesn’t use the Pluggable Function option, the only option we can use is to de-hook the existing function and then create our own.

So, first, in your child theme functions.php, remove the existing function:

/* first remove the parent function */
function child_remove_parent_function() {
 remove_action( 'et_header_top', 'et_add_mobile_navigation' );
}
add_action( 'wp_loaded', 'child_remove_parent_function' );

What we’re doing is creating a new (uniquely named) function which uses the WordPress remove_action function to the et_add_mobile_navigation in the parent functions.php.

With that out of the way, we then create our new function, which is simply the original one with a new name. Check out the code below:

/* first remove the parent function */
function child_remove_parent_function() {
 remove_action( 'et_header_top', 'et_add_mobile_navigation' );
}
add_action( 'wp_loaded', 'child_remove_parent_function' );

/* now load new one with new custom name, to not conflict with parent function name */

function et_add_child_mobile_navigation(){
 if ( is_customize_preview() || ( 'slide' !== et_get_option( 'header_style', 'left' ) && 'fullscreen' !== et_get_option( 'header_style', 'left' ) ) ) {
 printf(
 '<div id="et_mobile_nav_menu">
 <div class="mobile_nav closed">
 <span class="select_page">%1$s</span>
 <span class="mobile_menu_bar mobile_menu_bar_toggle"></span>
 </div>
 </div>',
 esc_html__( 'Menu', 'Divi' )
 );
 }
}
add_action( 'et_header_top', 'et_add_child_mobile_navigation' );

Build Beautiful.