1. Spawn model
2. Right click on it
3. Add Override materials
4. Right click again and Show in Element Viewer -> AnimationSet
5. Expand materials
6. Choose a material you want to edit (in my case it was body and head)
7. Right click on it and add Attribute -> float and name it “$phongboost” (without quotes)
8. Add another float attribute and name it “$phongexponent”
9. For Triss my values were 15 for phongboost and 30 for phongexponent