Try this, change line 841 on register.asp from
blnSentEmail = SendMail(strEmailBody, decodeString(strUsername), decodeString(strEmail), strMainForumName, decodeString(strForumEmailAddress), strSubject, strMailComponent, false)
to:
blnSentEmail = SendMail(strEmailBody, decodeString(strUsername), "youremail@yourdomain.com", strMainForumName, decodeString(strForumEmailAddress), strSubject, strMailComponent, false)
Where it says youremail@yourdomain.com change that to your email address where you want the confirmation email to go, that should send the email to you instead of the user..... i guess you already know how to change the language files so that it tells the users that the admin wants to review their application instead of telling them that they will receive a confirmation email....
Also have in mind that if a lot of users sign up it might fill up your email inbox and some of the confirmation emails might get lost so you wanna have an email address just for that and check on it often...