paulwpxp

Go to Appearance > Cutomize (or Theme options) and change the link color there, this will affect all links color.

To make change to only that part you mentioned, just make our selector higher in CSS Specificity. The reason your CSS in child theme can’t override the default is because theme injects custom CSS (from theme option) after main CSS, to override it we need to use selector with more/higher Specificity.

Use this code

body #content .page-entry-header h1.entry-title { color: #333 !important; }

We add in the body, this is just one in many ways to make sure our selector has more CSS Specificity, also the !important is needed in this case because theme’s default uses it so we have to use it too.

to set the number of images that a WP gallery displays

Since the total images in Native WP gallery is set by users upon creating the gallery, so I suppose you mean the number of image column.

We can do that by using “columns” option. The default when not specified is 3, we can change this putting our own number.

Suppose we have this, which will display 3 columns

[gallery ids="729,732,731,720"]

We can do this to display them in 4 columns

[gallery ids="729,732,731,720" columns="4"]

offer navigation to the next image(s) in the gallery

To do that we need to use some lightbox JS, look for a plugin that says “works with Native WP Gallery”. Since you already have Jetpack installed, try activate the image Carousel module and play around with it.

Another issue, if you don’t mind, is the postal address and tel number as header image. It’s bad UX especially in this case a site with target user group of old folks. Try viewing the site in mobile view, the text in image become unreadable. Postal address and phone number should be real text, copyable.

First of all, check theme option, theme might already provided users the option to change background color.

If theme doesn’t have that option, install a Custom CSS plugin, and use this code in it

body { background: #fefefe !important; }

Custom CSS plugin (pick a simple one)
https://wordpress.org/plugins/search.php?q=custom+css

It seems to me the site prevents right click, right?

Doing so people here won’t be able to help inspect element, not even to mention there is no real practical benefits in disabling right click.

There is this #sidebar display:none !important, and also #main width:100% !important going on here, look at line#220 @media only screen and (max-width: 685px).
https://themes.trac.wordpress.org/browser/melos/1.0.10/styles/style-responsive.css#L220

So basically theme wants to get rid of sidebar in smallscreen view. Since this theme is build on one of those Page Builder things so maybe this is just one figuration. There might be other configuration that will keep sidebar in smallscreen view.

However this code below when used in Custom CSS section if theme provided (or via Custom CSS plugin) will fix it for you.

@media only screen and (max-width: 685px) {
	#content #sidebar {
		display: block !important;
		width: 100%;
	}
	.layout-sidebar-right #sidebar #sidebar-core {
		margin-left: 0;
	}
}

However, when these are set the theme only actually uses the “Front Page” setting and the “Posts Page” setting is completely ignored.

Did you mean that when you visit the URL of the page that’s set as “Posts Page”, it doesn’t show list of posts?

The php function goes in functions.php in your child theme’s folder.