I would like to post on public mobile ad
http://prntscr.com/hl3tv4

@fabio
can you explain bit more what you need?

I would like to put on public mobile ad on top as in picture

You can add it to header.php

you have the code to insert

@fabio
Where should I got that code? It's your idea
Maybe something like:

<a href="<?php echo osc_item_post_url(); ?>">Publish listing</a>

I thank you for the code but it does not work ... I publish an ad I would like to insert it on a mobile like a photo ...

<a class="publish round3 tr1 " href="<?php echo osc_item_post_url(); ?>">
        <span class="non-resp"><?php _e('Publish listing', 'veronika'); ?></span>
        <span class="resp"><?php _e('Add', 'veronika'); ?></span>
      </a>


and use some style in css.

Thank you Dawid but the code where I have to go and insert it? b   

Where You Want try add to header.php

Find :

<div class="left-block">
      <div class="logo is767">
         <a class="logo-text is767" href="<?php echo osc_base_url(); ?>"><span><?php echo osc_get_preference('logo_text', 'veronika_theme'); ?></span></a>
      </div>


Paste this code below :
    <div>
       <a class="publish round3 tr1 is767" href="<?php echo osc_item_post_url(); ?>">
        <span class="non-resp"><?php _e('Publish listing', 'veronika'); ?></span>
        <span class="resp"><?php _e('Dodaj ogłoszenie', 'veronika'); ?></span>
      </a>
    <div>

This is just an example  You can go to me site fishboats.pl end test or can downlaod free aplication to android ( download button its in down site in footer ) have fun

header.php


 
<div class="left-block">
      <div class="logo not767">
        <a class="resp-logo" href="<?php echo osc_base_url(); ?>"><?php echo logo_header(); ?></a>
      </div
      <div>
       <a class="publish round3 tr1 is767" href="<?php echo osc_item_post_url(); ?>">
        <span class="non-resp"><?php _e('Publish listing', 'veronika'); ?></span>
        <span class="resp"><?php _e('Dodaj ogłoszenie', 'veronika'); ?></span>
      </a>
    <div>

Where You Want try add to header.php

Find :

<div class="left-block">
      <div class="logo is767">
         <a class="logo-text is767" href="<?php echo osc_base_url(); ?>"><span><?php echo osc_get_preference('logo_text', 'veronika_theme'); ?></span></a>
      </div>


Paste this code below :
    <div>
       <a class="publish round3 tr1 is767" href="<?php echo osc_item_post_url(); ?>">
        <span class="non-resp"><?php _e('Publish listing', 'veronika'); ?></span>
        <span class="resp"><?php _e('Dodaj ogłoszenie', 'veronika'); ?></span>
      </a>
    <div>

This is just an example  You can go to me site fishboats.pl end test or can downlaod free aplication to android ( download button its in down site in footer ) have fun

How can I have the icons as they are in the image?
The color boxes of the categories can be changed the width so that there are 3 up and 3 down?

@alexandromt
You may change things like this in style.css / responsive.css

I know it is changed in responsive.css but I do not know what the code is so that it looks like it appears in that image ...

Where You Want try add to header.php

Find :

<div class="left-block">
      <div class="logo is767">
         <a class="logo-text is767" href="<?php echo osc_base_url(); ?>"><span><?php echo osc_get_preference('logo_text', 'veronika_theme'); ?></span></a>
      </div>


Paste this code below :
    <div>
       <a class="publish round3 tr1 is767" href="<?php echo osc_item_post_url(); ?>">
        <span class="non-resp"><?php _e('Publish listing', 'veronika'); ?></span>
        <span class="resp"><?php _e('Dodaj ogłoszenie', 'veronika'); ?></span>
      </a>
    <div>

This is just an example  You can go to me site fishboats.pl end test or can downlaod free aplication to android ( download button its in down site in footer ) have fun

In the mobile version (responsive), I would like to have the smallest search box and on its right a small button that says publish