you can use the "rename" feature to change
the page name.
Right now, to change the page title you have to switch to "advanced" mode
in your user profile and edit the page in wiki mode.
Funny thing: the title field is empty in wiki editing mode. This is what
wonders me a little. And furthermore: Can I separately change name and title
(what would be extremely helpful in my case...).
Bests,
Moritz