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I have created Sites linked, attached a VF form, by the use of form i want to update the field of that user.

I have created a button on standard layout on Conatct Object,name as "SEND MAIL" button when I pressed it will be sending a mail to the given mail ID. Now i want when he open the link he will get a VF form, with the help of VF form he will update his contact fields.

Name: Maddy                              Email :Maddy@gmail.com              these two field i have in Contact object, now i want update few field on                                                                                                                         Maddy Conatact such City,Countries 
City                       :   
Countries             :   
Mailing Address  :                         these field i want update from vf page which i have send on mail to the user