How to remove bold header text on pages?

Never change the code of your theme directly. When you update the theme you lose all the changes you made. Instead you could create a childtheme (see here: https://codex.www.ads-software.com/Child_Themes#How_to_Create_a_Child_Theme) or you could install a custom css plugin (https://www.ads-software.com/plugins/search.php?q=custom+css.)

Once you have done that you need to add some css. If you don’t want the page title to show at all, use the following css:

.home .entry-title {
         display: none;
}

if you want the font to be normal weight, do this:

.home .entry-title {
         font-weight: normal;
}

I used the Child Theme Configurator plug-in and created a child theme using their tutorial. Thankfully it’s active and seems to be running smoothly. However, I added your css and it does not seem to be working. The bold font on my pages are still there. :/

Could you post a link to your site so I can take a look at your page?