The Library
What happens when close your project and open it back up?
There is nothing there? Well, there is but we can't see it.
>Window >Library. This opens the library window.
Double Click on the icon of the symbol you wish to edit and you are in the library. You know you are in the library because there is not the restriction of edges seen in the scene. There is also a little cross hair where you should be creating your work. If you get lost, double click on the hand tool to bring you back to center. (To return to the scene, click on Scene1 in the right corner.)
Save your work.