Values from image problem

can someone tell me what i’m doing wrong. All steps are based on several tutorials, but still I cant do what I need.
I have done a plane from mass, after I have placed an elements based on grid on that plane. Problem is that when I try to give a values (circle radius - witch need to be betwen 0.02 to 0.132 ) to elements based on image it shows nothing.

I am a new user so any help would be helpfull.