There are many instructions on here especially in the forums. Below I have to say is my favorite. Hope this helps.
http://cakecentral.com/articles/6/how-to-make-a-topsy-turvy-whimsical-cake
This site can very difficult to search. Instead, go to Google, put in your search terms (topsy turvy cake tutorial, for example) and then add site:cakecentral.com to the search terms. That will return hits only from this site, and there will be many good ones from which to choose.
airedalian I never thought if that! The search engine on here is a bit weird I can never find anything I'm actually looking for and then get distracted by what I find lol.
Bakin4luv there are all kinds of tutorials for making topsy turvy cakes all over the internet, I would just Google it then you can look through a load of different ones to see which one you like 
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