In addition to @statman , did you look at JMP Help?
Design of Experiments Guide (jmp.com)
And there are many examples under "Help --> Sample Data" regarding DOE. Look e.g. for vinyl, this is an example with mixture components and process factors, with results, probably this would be worth to look at.
Additionally I can recommed the STIPS DOE course: Design of Experiments (DOE) Course | JMP, it's a good introduction, and tells you about JMP's DOE capabilities and which terms are used - terms are important.
And executing the following script will give you an idea how a very simple mixture design in JMP may look like (New Script, paste it and execute, I took this from scripting index).
Names Default To Here( 1 );
d = doe( Mixture Design );
d << Mixture Design Type( Simplex Centroid, 2 );
Georg