URL Images

Hello,

     I am having troubleshooting some SEO issues on my site. One of which is the way my site appears in a search engine ( seems to be only mobile). There are images that appear with my link along with a description. I have updated my description but it is still the same. I also can not figure out how to change or edit the images that appear with my site's URL. Can anyone direct me to the area on the backend where I can edit those images or switch them to different images?