How to unstack captioned images

Hello folks, here’s a link to the page in question.

As you can see, there are customized images that serve as buttons for a separate page. I’d like to have a caption box for each button. When I use the WP function, the images actually start stacking on top of each other instead of naturally going from side to side.

Is there a plugin or a fix that lets me have a page that looks like this but with captions under each image?