Click the tools icon (Edit) below each image, select the Inactive button, click the Update button and then click Insert image.
This will insert code in your text box - something like:
You can position the code anywhere in your text. Keep in mind that the size of the image needs to be relative of the column width...
Column breaks are not supported yet as far as I know (and it doesn't have to do with Indexhibit, but rather with the javascript plugin itself)