I don't have a tutorial that I know of for this, but I can tell you the steps.
1) Save the UserLevel column in the session from the Authentication server behavior on your login page
2) Go to WebAssist->Security Assist->Manage Site Access->Access Rules Manager and create two rules "admin access" : Allow If UserLevel = 1; "editor access" : Allow If UserLevel = 1, Allow If UserLevel = 2 (user access is the default for a logged in user if they aren't admin or editors, so you don't need that rule)
Now you can use the access rules to hide and show elements on the page using the Security Assist->Show If server behavior, or restrict access to pages based on the security rules you have defined.