how to give access for a user in the system to set up his web page

[kamesh jayachandran <kameshj@xxxxxxxxxxxxxxx>]

I want to know how to give a user a right to set up his web page like 
somedomain.com/~username/
When I try to access a member page in my system like localhost/~member/ ,I get 
a error message like  access forbidden.
Thanks in advance
kamesh jayachandran

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