The theme contains various configurable settings and options. Under the theme settings page, you can change your website logo, header style, you can add links to your site social profile pages, etc.
To change the logo, do the following:
TheMAG comes with four predefined header styles. Click the Header tab and choose a header style for your page.
Click the "Social Media Pages" tab to add links to your social media pages.
Click the Content tab to configure date format and author info for article teasers. You may need to clear Drupal cache to see the changes on your website.