Hi Neo,
Manually moving a wiki page is not recommended because any other page can link to it.
This plugin
http://wiki.splitbrain.org/plugin:pagemove is created to tidy up such links, and lots of other system details, by scanning through all pages.
Can you detail further "on the Page, where i can edit pages and namespaces" ?
Normally you can see this on the page footer or in the page's url.
Cheers.