This video explains the process of setting a fluid as a Bingham plastic in a database. The user must select the database fluids and add a new fluid, accessing the viscosity data. The non-Newtonian viscosity is defined based on the available information, such as viscosity model constants or yield stress values. The Bingham plastic class requires entering yield stress and coefficient of rigidity. If the data is presented as a table of shear rate versus shear stress, then the viscosity definition must be set to shear stress shear rate, with at least three data points needed to plot the curve relationship on the right-hand side.