How can I change Daydream Material values?

Hello,
I'm newbie at Unity

I'm stuck to change Daydream Material Values in Runtime such as Base Color, Emissive, Texture and so on.
When I use 'material.color = Color.red;', it didn't work on 'Daydream / standard' shader.
And I have no ideas about how can I access to values of Daydream shader in Runtime,.

I searched about changing Daydream Material values, It was hard to find it.

Would you please help me and other newbies?
Thank you!!