Keith,
You'll need three things to make this work.
1. You need the role based security module. Since you in trial, I believe this is included, so you should be good to go. If you need this going forward, this is a separate purchase than the framework.
2. You need to reference the security library. Just right click the project in the solution explorer and click on properties (or somehow open the properties for the project). Make sure there is a reference to the Microfour StrataFrame Security module. If not, click the add button and scroll down until you find it.
3. You will need to use the correct names space or fully qualify the name (Microfour.StrataFrame.Security.SecurityDialog). Just put a using statement at the top:
using Microfour.StrataFrame.Security
Or in VB
Imports Microfour.StrataFrame.Security
Hope that helps! ...and don't worry about asking questions. Many of us were/are in you shoes, so by asking you help both yourself and anyone else who is in the same boat (I was a bit over a year ago myself)!