First go to your Wordpress admin and click the "custom file editor" in thesis options. Now copy that code which is showing in the video and paste it in the custom.css file and click on the big green save button. Now select "custom_functions.php" in file editing menu and click on "edit selected file". Now copy that second code which is showing in the video and paste it in there. In the codes, you can change the "comments_number", "add your- opinion", "continue reading" as you want and click on save button. Now select the custom.css and click on "edit selected file" and copy that third code which is showing in the video and paste it in there. You can change the colors of border, background as you like and then click on save button. Finally you can see your site for the changes. There are also two things in there which are showing in the video, if you want to remove it, go to "design options" in thesis option and go to teaser box and uncheck the "number of comments" and "link to full article" and click on save and you are done.