You can insert inline images or links to other articles in the body.
Images should be of the form:
<img src="../(THIS_POST_NODE_ID)/assets/(FILENAME.FILETYPE)" >
Be sure to upload your image and put it in the manifest.
Article links should have the from
<a href="../(OTHER_POST_NODE_ID)/index.html" >
For more information on creating templates and for some useful helper functions please visit the How to Create your own templates page.