Where is the dielectric constant button in DS2.5?

Dear everyone:

Recently, I  try to use the DS2.5 soft to study the dynamic simulation. I used the Windows version.

I want to use the organic solvent(CH2Cl2) to my simulation,but I have not been  modified successfully.

I find one answer about the questions. But how to do or how to click the button can change the dielectric constant.

That is to say where is the button of changing the dielectric constant in  Windows version DS2.5.

Thank you very much.

Thank you and best regards.