error messages

I added the free version of Surcuri on a WordPress site that I manage for a non-pofit organization that provides food and services for the needy. I’ve become concerned about malware on their website, so I installed the Securi plugin. It’s generated some messages,and I don’t know what to do about them or if they’re even a problem. Here’s a screenshot. And when I hover over the part that says something about payload, this is what I get. The site works fine. One person from tech support where the site is hosted said that the alert in red may have been something the plug-in itself generated. This organization doesn’t have a lot of money. They can’t afford to pay the next level of “Securi”. I’m a non-coder, but I have the ability to edit code or take it out. I also wouldn’t mind hiring someone who might be able to give me more info, or correct the problems if there are any. Any ideas?

The page I need help with: [log in to see the link]