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://ww.wp.xz.cn/plugins/really-simple-popup/