How to add "enclosing element" to CSS

Hoping someone with more experience working with CSS can help. I'm trying to add a new feature that AddThis.com offers — the ability to add social share buttons to images. When I turn the feature on, it adds them to all the photos on my site. I want to limit this feature to just one of my pages. They said I could do this by adding an enclosing element around the images I want affected. 

For reference, here is their explanation on how to do this: http://www.addthis.com/academy/how-to-customize-the-images-for-the-image-sharing-tool/

I think I can do that... if I can find where to do it in the CSS! I've looked using the Weebly code editor. The page or images  don't show up anywhere in the main style page and I don't see an image file in Assets or anywhere else. I downloaded the files and looked that way, too. 

When I view the page in question in my browser and look at the Page Resources, I'm able to see the image files and their locations in the html. But where do I find that file so I can make changes and add the enclosing element?

Here is the page that has the images I want enclosed so they are shareable: 

http://talktoanimals.weebly.com/shareable-stuff.html

Grateful for any help or direction!

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Hey there! I'm no coder myself, but you may benefit from checking out our documentation here.

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Thank you! I had seen that and it's a good overview, but doesn't have a lot of specifics. I need to find out where the images are in the CSS!

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