If your Text Box contains both text and images, you can ensure that the text wraps around the image like this:

First, click the image to activate it. When the image is activated, a small 'edit' button will appear in the center of the image.

When you click the 'edit' button this screen will appear:

Choose either 'left' or 'right' from the 'position' menu as shown below:

Then click 'Save'