Josh Robbs on "How to get rid of blank space between photos"

It's the CSS from the theme.

Go to Appearance -> Editor

Find a file named "wp.css" in the right column and click on it. It will pull it up in the editor.

Find this area in the file:

/* Images
-------------------------------------------------------------- */

.entry-content img {
	margin: 0 0 1.5em 0;
}

Looks like it should be right at the top.

Replace that 1.5em with a 0 (that's a zero, not the letter) and click save.

The right way to do this is to build a child theme in case there's an update. But you said you're not a coder so we're doing the good enough solution. Just be aware that if there is an update, the change will probably be over-written.

Let me know if you have any issues or need a hand with something else.