Hi Kevin,
Please check our documentation (Custom Action Help section) for a complete description about how to use it, how to create your custom code, etc. Also the sample project comes with usefull comments. Once you start working on the code if you have any issues I can help.
If you don't have access to the installation folder you can download Quest Web Parts and install in on your local machine so you get the Sample Code project.
Also please remember that after you have your code you need to deploy it on the server (private bin of the web application then GAC).