Disable Navigation for Images

Hi. First of all, thank you! This is the only popup plugin that I was able to get to work in a very quick and easy way with an image map. ??

Here′s my question – how can I disable the navigation? I just would like to show *one* image only, but it automatically picks up the next image that is in the page. Is there a shortcode how to do this? Thanks.

https://www.ads-software.com/plugins/really-simple-popup/