If the material is an instance parameter: Under Materials and Finishes, locate the material parameter to change. Click in the Value column for the parameter.
If the material is a type parameter: Click Edit Type. In the Type Properties dialog, under Materials and Finishes, locate the material parameter to change. Click in the Value column for the parameter.
If the material is a structural parameter: (for example, if the element is wall) Click Edit Type. In the Type Properties dialog, for Structure, click Edit. In the Edit Assembly dialog, click in the Material column for the layer whose material you want to change.
Click .
In the Materials dialog, select the Materials tab.
On the Materials tab, select a material, and click OK.