Use typical HTML to call in an image:
<img src="frog.gif">
gives you 
All you need are the graphics and a directory for them to live in. WikiWriter comes with a handful of sample graphics in a directory called "images". Copy this directory into your project folder so you can add a little decoration to Second Page like this:
.plan .cent == <img src="rednext.gif"> My second page. <img src="redprev.gif"> .end .end .result # Link back to ((Home)). - [[b a good place to start]] # This link goes to the ((Third Page|next)) page. - [[rev still needs some work]] /# .end
Stunning: