Spoiler icon missing, can I use images to trigger

My dev site is currently at http://stacey.hoffmangraphics.com/jumpstart/ running newest WP and plug-ins. I’ve selected to use an arrow with the spoiler trigger but it’s not displaying. What I actually wanted to do was put an image in the trigger area and then click on it to see the rest. Is there any way to do that?

I currently have this code
`[su_Whitney-Bishopspoiler title=”Click to Read Whitney’s Story” style=”simple” icon=”arrow”]

and tired replacing the title text with an image but it didn’t work.

Thanks for any help.

https://wordpress.org/plugins/shortcodes-ultimate/