You can update the page that the user is sent to by adding in this line of code on the page around line 114:
<?php $WA_Store_Cart->redirStr = ""; ?>
You can put the name of the page in the double quotes, it will then take you to that page after the email is sent.
There may be a problem with the link that is being sent if you are not seeing any activated users. I'm waiting on the message now myself. If you are not getting the emails for some time it is probably due to how your mail server sends out the messages. The code for the registration is just sending the email to the server, it does not control when the message is sent.