Change number of items per page, and adding multiple images per product

Just wanted to know if there is a way to display more than 4 items per page?
As I am entering more items into our database. I feel it might be a issue
in the future. We have been getting feedback from our customers and it's
hard to navigate to look at 100 items and only seeing 4 at a time. Right now
the rings are getting cumbersome to look through. 4 items a page is not
going to work.

Another thing we wanted to see about adding. In the prices per item. Could
we add "Suggested retail" next to that part?

Finally, I cannot seem to understand how to add more than one picture per item.

Can you post a link to your site? The stock version displays 10 or so products per page, and you can set that in admin > Configuration > Maximum Values > Products Listing- Number Per Page.
Some templates may artificially restrict this and disable the admin control.

For additional images, see the tutorials (link at top of this page).

This is a great start - thanks. I am new to this and did not even know where to begin looking. The website is rpdiamonds.com. I still need to figure out how to add custom fields and multiple photos but our biggie was showing more than 4 items per page.

As I thought, you have a Template Monster template. I suggest searching on them to see issues others have had with their templates. It may be difficult to modify their standard layout, as they do things in their own unique way and the usual advice given here may not apply to their templates.

Cool now I am dying to know, how did you identify it as a TM?

First, I have seen that 4-product limit on the listing before on one of their templates.
And once I could see your site, a View Source showed the template name /themexxx/ which is a standard kind of name for them, and the code is uniquely their style... convoluted and replacing the standard meaningful Zen Cart tags with their own cryptic ones.