Unsubscribe With No Login
For those of you who want the option of users unsubscribing without having the user log in, this is the way it was accomplished in my case:
1. Create a new page called unsubscribe_confirmation.php using the themed_content template. Add whatever message you want to display after the user has unsubscribed i.e. "You have been unsubscribed from our Newsletter." in the "main" editable region.
2. Open the file unsubscribe.php Select "SecurityAssist Restrict Access to Page" in the Server Behaviors panel and click the minus button to delete it.
3. Go to code view in the file and search for where the variable $canView is set and change the value set to "true" i.e in my case this was line 24
$canView = getUserCanViewPage($MailingInfo);
Change it to...
$canView = true; // getUserCanViewPage($MailingInfo);
and line 90
$canView = getUserCanViewPage($qsID);
$canView = true; //getUserCanViewPage($qsID);
4. Change the redirects to send you to the file you created in step one. In my case there were two, one in line 40
$WA_redirectURL = "unsubscribe_confirmation.php";
and one in line 78
Save the file and that's it. I realise that there are probably other ways to do this, but this gives the desired result for me.