Choose DOE > Mixture Design and make the design data table. Remember that to fit a model, the Y column in the data table must contain values, so either assign responses or click the red triangle menu and select Simulate Responses before you click Make Table.
Right-click the model and select Run Script to launch the Fit Model dialog, which is automatically filled with the saved model.
Click Run on the Fit Model dialog.
The hidden-intercept property also causes the R2 to be reported with respect to the intercept model rather than reported as missing.