Authenticate user question

I am using the SecurityAssist – User Level Authentication instructions and have got to page 4 where is says:
3. Select the Visitors_Update page.

I can't see any such page. I have visitors Registration, LogIn, LogOut, emailPW and Profile. Where do I find Visitors_Update?

Looking down this page I also see references to the AccessDenied page and the Visitors_Insert page, and I don't have these either. Have I missed a step somewhere?

I have spoken with the client and negotiated a simplification - there will be a group called Administrators with site-wide access, 40 different trial member groups each with access to various folders on the site (this is an ethics committee requirement &^$@!$*&!!), and of course general access which does not require a log-in. I have proceeded far enough to see that I will be applying folders/files to each different user group but it might be easier to apply different user groups to each folder/file - is this possible? Asking just in case.

Thanks.