acosmin

I’m sorry it’s not possible. I assure you it won’t look good and it might ruin the responsive part.

To add the share buttons read the Documentation, Tips Hacks section

As for avatars, you need a Gravatar associated with your email address.

It doesn’t make any difference, it just adds an icon to your post 😀

The images you are uploading should be bigger than the width and height specified here:

add_image_size( 'ac-slide-thumbnail', 515, 300, true );

You can hire a freelancer… http://jobs.wordpress.net/

Open header.php and remove these lines:

<div class="logo">
        	<a href="<?php echo esc_url( home_url() ); ?>" title="<?php bloginfo( 'title' ); ?>" class="logo-contents<?php ac_logo_class(); ?>"><?php ac_get_logo(); ?></a>
            <?php
				// Ads variables - Options Panel
				$ad728_show = of_get_option( 'ac_ad728_show' );
				$ad728_code =  of_get_option( 'ac_ad728_code' );

				if ( $ad728_code == '' ) :
			?>
            <h2 class="description"><?php bloginfo( 'description' ); ?></h2>
            <?php endif; ?>
        </div><!-- END .logo -->

Did you try unpacking that file? There are four files in that archive, unpack it and please read the Read me.txt file.

Also read the documentation