Curved Poly Editor is mainly organized into Windows which you can open from menu at Tools>Curved Poly
Once the main Editor Window is available, there are a total of 8 Tools Sets which can be activated and used for different purposes. Once you open the window, only Game Objects Tools become available, the other ones being useful only after a Curved Poly GameObject has been correctly created and setup.
If you choosed to move the Gizmos Folder during Setup, a few icons will be used to help you find your Curved Poly Contents: