Some HTML coding is required to add another image to a post. Note the code required to open the enlarged image in the 'lightbox' module.

<a href="http://paulbakker.id.au/sites/default/files/images/imagename.jpg" rel="lightbox">

<img src="http://paulbakker.id.au/sites/default/files/images/imagename.thumbnail.jpg" width="200" height="150" alt="Image description" hspace="5" align="left" />

</a>

Remember to replace 'imagename' with the actual name of your image.