Twitter Plugin not working correctly. Help please

I am trying to help a buddy with his site. It looks like someone tried to add a plugin that isn’t working correctly. The plugin is referenced here: https://wordpress.org/plugins/ai-twitter-feeds/

See this pic to see how its displaying on his site.

Can someone tell me how to make this function correctly? Or alternatively how to remove it from his site? Preferably how to make it function correctly.