You're not giving us a lot to go on but I'll give it a shot.
I assume that you are using the User Level Authentication section under Solution Recipes here securityassist/
The steps would be:
- Setup your user database
- Create your login and protected pages
- Create your Access level rules
- Apply the rules to the protected pages
Where in the process do you need help? Not all of the videos have been updated for the current versions, but the principles are the same. I believe WA is in the process of updating all of the documentation.
10 Tips for getting quick help from a support forum
http://www.ipvac.com/kb/entry/149/