Add a text link
<a href="http://ENTER-UR-SITE-URL-HERE.com>SITE NAME GOES HERE</a>

Add image
<img src="put picture url here">

Add image with border
<img src="PUT PICTURE URL HERE" border="PUT A NUMBER HERE">

Make bold text
<b>PUT YOUR MESSAGE HERE TO APPEAR IN BOLD</b>

Make text italicized
<i>PUT ITALICIZED MESSAGE HERE</i>

Make underlined text
<u>PUT UNDERLINED MESSAGE HERE</u>

Change font face
<font face="PUT FONT NAME HERE">Change MESSAGE TO WHAT YOU WANT</font>

Change font color
<font color="put color here">type message here</font color>

Credit: Eryca