Enlarged pics get way too large.

This is probably a very basic question, but I had my site updated to ZenCart by pros and now I'm trying to learn the ropes.

When a customer enlarges a picture on my website, www.theleviteline.com, they get a too large for the screen picture. You can see this under Shirts, if you click ahead to where the Enlarge option would appear, you'll see what I mean. This occurs for all my pictures.

This is probably very simple and I apologize for wasting the time of those who know this easily, but I'm at whits end trying to get a grip on my site.

I also want to add new text pages without knowledge of HTML. That is another issue I'd like advice on.

Zen Cart does not resize the large image it displays it at what ever size it is

One of yours is
width: 3072px
height: 2304px

One would have to use their graphic editor an resize them in proportion to a maore desired size