Change Image or Gallery Position

Hi,
you can make it looks like that to some extent by going to wp-admin / Appearance / Customize / Additional CSS panel and adding there the code below

.wpadverts-slides.wpadverts-slides-with-thumbnail {
    width: 35%;
    height: 200px;
    float: left;
}
.adverts-single-box {
    float: left;
    width: 55%;
    clear: none;
}
.adverts-grid.adverts-grid-closed-top.adverts-grid-with-icons.adverts-single-grid-details {
    clear: none;
    float: left;
}

But, much better results you would get by customizing the wpadverts/templates/single.php template file, this will, however, require some PHP, HTML and CSS knowledge.

If you are not familiar with these technologies i would recommend using the default layout.