Add Title to Banner for Affiliates

Hi! In the banner tab for affiliates, I need the title to appear above the image or above the code. I have 10 banners and they were made for specific uses and there’s no way for the affiliate to intuitively know which one is which. If there is a line of code that needs added to .php file, please be specific with the actual code needing added and where. I have a child theme in place but am also comfortable updating the banners.php file. I have a question though, if I update one of the template files, do I replace it or do I add it to my child theme (if child theme, can you be specific with how that’s done?). Because I’m using this for a fundraising site, there is a few placed where I’d like to change the text from “affiliates” to “fundraiser” (like in the registration form and thank you message) so as not to confuse the user. Thanks!!