1. Go to the material manager.
2. Create a new material.
3. Optional: choose a picture of your material. Give it a name, select a category and camera profile.
4. Choose your thickness.
5. Add your methods and tools.
6. By clicking in the circle you can choose the default tool.
7. You can change the properties if you want.
8. Click 'ok' to save everything.
9. It is advised to back-up your material manager.