Materials consist of the properties necessary for structural analysis: Young's Modulus, Poisson's Ratio, Density and Coefficient of Thermal Expansion or Contraction. Note that these are not material strengths, which are related to code checking. Those get entered in a different location.
Materials can be defined and assigned using the Materials table, which can be accessed by clicking:
•Create (or Modify) > Member Properties > Materials
•Create (or Modify) > Shell Properties > Materials
•or by clicking Tables > Materials.
Regardless of how the table is accessed, it allows the user to create material definitions and to assign them to currently selected members.
Note that there is a Standard Material button on this table that allows for the quick definition of many standard steel and concrete materials.