Just add the title of the new page to the end of the URL:
Take note to have capital letters where suitable.
Googling for help
This software is called "MediaWiki" so if you want help on something like "How to create tables" then make sure to specify the program. Wikipedia uses the same software.
This is the original MediaWiki list for getting started should anyone ever need it.
Consult the User's Guide for information on using the wiki software.