abaqus modeling question

Hi
dear.

I
have a question about  abaqus  soil modeling

In
soil abaqus modeling I want know that when I assign a plastic properties(mechanical
plasticity) such as mohr moulomb,in 
cohesion tab we see two data that I don’t know what data I can insert  there.two parameters are  : 
cohesion yield stress   and     abs plastic strain.

Plz
 give me a true data parameters.and  friction angle and dilation angle about one
soil

Tnx
a lot                                                              

Abs plastic strain

Cohesion yield
stress