Add blog author info to the post

You need edit next files (they lay in root directory)

You should add next code in each file 

    <div class="author-box">
        <div class="left">
            <div class="avatar_photo">
                <?php echo get_avatar( get_the_author_id(), 96); /*max 512*/?>
            </div>
        </div>
        <div class="right">
            <h4 class="title"><?php the_author(); ?></h4>
            <?php if ( get_the_author_meta('description')): ?>
                <p class="desc"><?php echo get_the_author_meta('description');?></p>
            <?php endif; ?>
        </div>
    </div>

before tag </article>. For example,

Also you should add into style.css next css code:

.author-box .avatar_photo {
    height: 85px;
    width: 85px;
}
.author-box .avatar_photo {
    border-radius: 50%;
    float: left;
    margin-right: 24px;
}
.author-box .avatar_photo img {
    border-radius: 50%;
    height: 80px;
    width: 80px;
    max-width: 100%;
}