Anyone can edit and add to Wikitopia. All you need to do is to simply click on the Edit tab and start writing.
History allows you to view the changes that have been made on the page. When you click on it, a list will be displayed of all the contributors and when their contribution was made.
Discussion tab shows users’ discussion and possible revisions, debates…etc.
If you prefer starting your own Wikitopia rather than contributing to the main page, you'll need to create a page. Here's what you do:
1) Come up with a name for your Wikitopia (and keep it short!).
2) Enter the name of your Wikitopia in the search field on the upper right hand of the page.
3) If a Wikitopia with that name doesn't already exist, you'll be asked if you want to create the page. Click on your title and start writing. (If a page with your title already exists, come up with a new name and start again). And be sure to save when you are done.
4) E-mail the Wikitopia administrator with the name of your Wikitopia so we can list it on the Main Page.
You're done! Soon your Wikitopia will be listed under "Your Wikitopia" in the Main Page and you will have your own page to continue (re)imagining your Wikitopia. When you are done with your own Wikitopia, please think about sharing parts of it with the main, collectively-created Wikitopia
As with all Wiki-projects, your page and the main page are open to everyone - anyone can edit and add to Wikitopia, including yours.
If you have more questions, you may want to have a look at Wikipedia FAQ