Hi Janet,
You can use the following data tags:
1. My Registration URL : Use this data tag if you are looking to hyperlink indicative text or a button in the email. You need to copy this from the list of data tags and hyperlink it to the text or button.
2. My Registration URL : Use this data tag if you would like to show a default link along with the indicative text.
Both these data tags will redirect the registrants to a page where they have to enter their confirmation number and upon validation they will then be redirected to their registration record.