Using User:JohnSmith in a link will fail, because the browser tries to use a protocoll named User.
change the default convention from User: to User- (tested in Tiki-7), the page can now be accessed via:
This is also found (with the same names) in the config of the "User Features" tab of the Community feature. See also the MyTiki page http://doc.tiki.org/MyTiki for the use of MyTiki section to display the User Page.
On Tikis community Website:
login to tiki.org (community website)
there click the link/button "my information"
scroll down a bit and find the row:
edit the page and access it via http://tiki.org/UserPage