Need help in sar calculation

How to define powerloss monitor in CST?
I am begineer in it,and i need help for my work.please...any one can help me?

On project tree, right click on field monitor and select powerloss/SAR mointor

I order to for this monitor to register data you will have to define a material that has density values e.g. in the material parameter tab, choose density and insert e.g. Rho: 1200 kg/m^3