Querystrings

Populating a Field via a Querystring

You can populate a field with data from a querystring by setting the default value of a field to be the be the key of your querystring.
querysting-key-as-the-default-value

This will set the value of the field to whatever the key equals in the querystring in your URL.
querystring-key-equals-name

Using data from a Submission as Querystring data in a redirect

You can create a redirect action that contains a merge tag from the form as part of the URL. use-merge-tags-in-a-redirect