Hi there,
I would like to request for a new wiki on myxwiki.org, below is the information for the creating:
description: Will be used for XWIKI test
owner name: brian
wiki name: Contoso
Thank you 
myxwiki.org is not exactly the best to test XWiki features since you are not allowed to use everything that require programming right (install or make various extensions which require it, write scripts in languages others than Velocity, etc.).
An alternative is to download the all in one demo package.
Still want a myxwiki.org instance ?
For testing you could use XWiki Cloud from XWiki SAS, see Try XWiki - XWiki
It’s easy to set up and you’ll get programming rights and more.
That’s okay, please.