It’s in the ‘content’ section of the email all the way at the bottom. You can even send test emails to more than one email separated by commas.
When you add images to the content editor, you can use the left, center and right justify text icon to align the image with the text. This will cause the text to wrap around the image. See this video from our support team for an example.
You can also edit the advanced tab with code ie., float: left; margin-right: 10px;