How do you Define an Elastic Modulus for undefined material?

When trying to apply E-Glass Fiber as my material I get mesage "Elastic Modulus is not Defined for this material, please select a material for which elastic modulus is defined.   So I went to the Options and Material Prop. to try and define and it is also grayed out where I would normally imput modulus data.

thanks in advanced

rich

SolidworksSimulation