User Authentication wizard no showing UserLevel session variable

I read an old post that said you can't use Secure Pages with SecurityAssist Pages as the redirects conflict. I had that issue, so I'm trying to add user level authentication to an existing SecurityAssist login page.

So far, I've added a 'UserLevel' database column to my existing User table and am following the tutorial.

In the Authenticate User wizard > Database tab, the tutorial isn't clear where the value comes from. I selected the Server Variable as it was closest to the POST code in the tutorial, even though 'UserEmail' and 'UserPassword' weren't listed (I adjusted the code manually).

In the Dynamic Data window > session group it says select the 'userLevel' session variable, yet there's no userLevel session variable in the list.