There are two ways to save materials.
- Right-click a material directly on the model and select Add Material to Library.
- Click the
Save to Library icon on the Material Tab in the Project Window.
Once you have gone through either step, a dialogue will prompt you to designate a destination folder in the material library. After the folder location has been selected, the new material will be saved to the library.
Note
You can create your own folder to save custom materials. Simply click the 
add folder icon in the Material Library.