Looking at the source code on the page, I don’t see your iframe. Did you change it since then?
However I do see the Twitch.Embed JavaScript code, as seen in this image. You should change it to look like this:
new Twitch.Embed("twitch-embed", {
width: 280,
height: 158,
channel: "gamingmorningshow",
allowfullscreen : "true",
layout : "video",
parent: ["gamingmorningshow.tv"]
});
After that, leave the code highlighted in my screenshot, and remove your iframe you mentioned in your post.
This is all described further here: Everything | Twitch Developers