Problems after changing hosting

I recently changed hosting to one.com and after many problems I could have my blog online again.
But now everything looks odd, there is no header anymore, if I click the menu options I get a 404 page etc.

I have no idea about programming, codes, etc, when I uploaded Colorway a couple of years ago everything went good through the dashboard, I never had to change anything myself or cope with technical problems. Therefore, I am totally lost at this moment.

If I go to the personalize option at the WordPress Dashboard this is what I see above:

Notice: Undefined index: header-layout in /customers/a/2/8/studioyedra.com/httpd.www/wp-content/themes/colorway/includes/customizer.php on line 2146 Notice: Undefined index: header_v_pad in /customers/a/2/8/studioyedra.com/httpd.www/wp-content/themes/colorway/includes/customizer.php on line 2146 Notice: Undefined index: content_v_pad in /customers/a/2/8/studioyedra.com/httpd.www/wp-content/themes/colorway/includes/customizer.php on line 2146 Notice: Undefined index: stky_logo_width in /customers/a/2/8/studioyedra.com/httpd.www/wp-content/themes/colorway/includes/customizer.php on line 2146

The page I need help with: [log in to see the link]