[pmwiki-users] PmWikiUsers: This post has been blocked by the administrator

[Felix E. Klee]

I'd like to add

  [[http://www.tagtrade.org | TagTrade.org]] - a web site about tag
  based trade on the Internet.

to the projects section on

  http://www.pmwiki.org/wiki/PmWiki/PmWikiUsers

However, when - after editing the source code - I hit the save button,
then I get the following error message, without further explanation: 

  This post has been blocked by the administrator

How should I proceed?

-- 
Felix E. Klee