@MarinaMaine: We understand you are frustrated. However, please understand that the point of our advices/directions we give you are also for any future reader of this forum that may having similar issues. We volunteer our good, solid, FREE advice in our SPARE time to help you. We get no payment, trade, or compensation of any kind. Also, we are skipping a cumulative decades worth of experience and boiling our directions down to the simplest form possible in an effort to help you. That being said:
ALL themes have a style.css file. It is a standard of WordPress. It is in the folder with you theme files ../wp-content/themes/journalism/style.css
You need a child theme so that any, clearly important, changes you make are not erased when an update to your current theme is installed. After you follow the directions to create and activate a child theme you will still be using 'this theme' for your website. You will simply be adding directions for your theme to follow. You will then add to a style.css file located ../wp-content/themes/journalism-child/style.css
This is the time honored, well practiced, standard way to alter your WordPress theme as outlined by the very creators of WordPress and used by over 77 million WordPress websites.
An alternate method, which you may appreciate more, is to add this plugin. Then follow the directions to add Tareq's code:
I hope this helps. All the best to you.