thanks for the quick reply,
- I made Override Plugin and placed it in the qa-plugins and its appearing in the admin area with the code as mentioned by you .
after doing so :
-now on the home page all user names have been changed to "anonymous" and when i click that question it does show the User Avatar , and its still linked to site.com/user/User+Name .. even clicking on a question it gives me "by anonymous"
- the User Tab is also still having the Old link structure (+) ,
thank you for the assistance , what i be doing wrong ?