Add A Redirect Link In Webform Submit Button
This is duplicated question.

But here is the answer
If i had to redirect the users after submission than i would go to the already created webfrom, click on 


Webform(on top of the form)->Form settings




After scrolling down a bit you will see Redirection location

Choose Custom URL and enter your Internal URL www.mysite.com/foo



Thats it you are done.