1. type a WikiWord (multiple words in camel base), in the parent topic you wish to create a child topic from
2. save the page
3. if the wiki word hasn't been taken yet, there should be a small ? mark beside it
4. clicking it will bring you to a new edit page
5. type something and save the edit page
6. you've now created a new topic

Sidenote, if you do NOT want to create a new topic when typing something in CamelCase, simply append < nop > (remove spaces) in front of it (or just hit Edit below and see it in code...)