What is a Wiki? (http://doc.tikiwiki.org/tiki-index.php?no_bl=y&page=Wiki)
Using Wiki Pages (http://doc.tikiwiki.org/Using+Wiki+Pages?bl=y)
Wiki Plugins (http://doc.tikiwiki.org/tiki-index.php?page=Wiki+Plugin)
You have a specific question, then write it here.
Navigation
The Tikiwiki have 2 navigation's.
Structures (http://simutrans-germany.com/wiki/wiki/tiki-admin_structures.php) and Categories (http://simutrans-germany.com/wiki/wiki/tiki-browse_categories.php)
On the categories is free access for all registered users.
On the structure have only a few users access. From security.
You want a structure created or changed, then post them here on the forum (http://forum.simutrans.com/index.php?topic=4676.0).
the leading users in Tikiwiki (http://forum.simutrans.com/index.php?topic=5807.0)
@ Mod: Please sticky this Post. - sticked ~vilvoh
Is it possible, create a sub forum for Tikiwiki Questions?
And move this post to go there.