Hello Daniel,

Please follow the theme instructions here : https://doc.acmethemes.com/supermagpro/#SettingupImagessize.
Also We recommend you to use plugin named Acme Fix Image ( https://wordpress.org/plugins/acme-fix-images/ ) to crop the actual size of the images. This is also described in the theme documentation.
Hope this will solve your issue.

Best Regards,
AcmeThemes

Hello Trajan2845,

Thank you for interest in our theme.
Please follow the documentation here https://doc.acmethemes.com/supermag/.
also Please follow this guide http://www.acmethemes.com/supports/topic/modules-setting-in-front-page/#post-418, it will be useful for free version too.
Further if you buy premium theme and want to see us problem, having confusion in setting up anything, want simple customization, we will do that for you free of charge. Only for heavy customization we request to order customization http://www.acmethemes.com/customization-request/.

If you have get any confusion, please feel free to ask, definitely we try our best for solving problem for our free theme user too.

Best Regards,
AcmeThemes

Hello younman,

Thank you for using our theme SuperMag.
Please go to Appearance=> Customize => Layout/Design Option => Custom CSS and use following CSS.

.single-thumb {
    display: none;
}

Hope this will solve your problems.

Note: This is just notification, in our pro version of theme SuperMagPro, you don’t need to use custom CSS, we have added option to show/remove featured image in all single post or show/remove featured image in a particular single post. You can check pro version of SuperMag Theme here http://www.acmethemes.com/themes/supermagpro/

Best Regards,
AcmeThemes

Hello giordani,

We just checked it through chrome Version 48.0.2564.116 m, in Windows 10 and Chrome 480.2564.116 in Mac OS 10.10.5, the banner is showing fine.
There must be some Advertisement blocking tool in your chrome, which is causing this, can you please check and confirm?

Thanks,

Hello Lellie Jo,

You are doing right way.
Further you can add category while adding/editing post form Categories box => + Add New Category too.

Best Regards

Hello giordani,
Thank you so much for using our theme SuperMag. Please visit the link for activate header advertisement banner.

SuperMag

We have a banner on our demo too. Please visit this link for our demo.

Home

If you have further more query, please feel free to ask.

Best Regards,
Acme Supports

Yes definitely our theme is child theme friendly, you can even override inner file of themes not only templates files.
Your child theme css is blank, please write following css in the child theme style.css:

/*
 Theme Name:   SuperMagPro Child
 Theme URI:    http://www.acmethemes.com/themes/supermagpro/
 Description:  SuperMagPro Child Theme
 Author:       Acme Themes
 Author URI:   http://www.acmethemes.com/
 Template:     supermagpro
 Version:      1.0.0
 License:      GNU General Public License v2 or later
 License URI:  http://www.gnu.org/licenses/gpl-2.0.html
 Tags:         orange, brown, yellow etc
 Text Domain:  supermagpro-child
*/

Again in functions.php file please write following codes:

<?php
function suprmagpro_child_enqueue_styles() {

    $parent_style = 'parent-style';

    wp_enqueue_style( $parent_style, get_template_directory_uri() . '/style.css' );
    wp_enqueue_style( 'child-style',
        get_stylesheet_directory_uri() . '/style.css',
        array( $parent_style )
    );
}
add_action( 'wp_enqueue_scripts', 'suprmagpro_child_enqueue_styles' );
?>

Here is further docs https://codex.wordpress.org/Child_Themes.

this should fix the problems.
if you again have any problem please feel free to ask.

Best Regards,
AcmeThemes

Hello James,
Thanks for using our theme SuperMagPro. Are you currently working on your site? Did you changed some code on theme ? If so let us know, there is no any bug on theme because we set up a demo and it is working fine. Please make sure you installed the whole package of theme, no missing any files.
If you have any problem more, please let us know.
Best Regards,
Acme Supports