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I'm send a link of Force.com Sites, I have linked a VF form, by the use of form i able to create a new contact.

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.

You have to create a javascript type custom button that will open a vf page in a new tab, and in the javascript you have to right the code of opening the vf page. using the URL of the vf page and passing the Id of the contact as parameter of the in the URL 

Here is the link of the trailhead module describing about the button