Margins around images & footer.css Troubles

Hello.

https://rabidfandom.com/ is the blog I’ve been working with. At first glance, you’ll notice that the image in my test post has got the text running right into it. When I created that test post, I used EditorMonkey to add and edit the image so that margins would be placed around it. Unfortunately, it won’t allow me to add formatting to my post images for whatever reason.

Is this an EditorMonkey bug?