Hi Lutz,
have you tried the sample data examples for ANOVA in JMP? Go to Help -> Sample Data, then ANALYSIS OF VARIANCE. There are examples for 2-way ANOVA as well MANOVA for multiple repeated measures.
In Addition in the help itself is an additional example "Repeated Measures Example" using the sample data "Cholesterol Stacked.jmp".
If that will not help enough, you might want to check out our YouTube channel JMPSoftwareFromSAS where you find Video tutorials as well for that topic. Last but not least you want to look at the learning library on our JMP website: Basic Inference - Proportions and Means | JMP Learning Library
There are one page guides and tutorials for several topics.
Finally we have a good friend in YouTube, ProfessorParris, who has plenty of nice Video tutorials which will help you get along with JMP. Here you go to some of those: ProfessorParris - YouTube
If you let us know where exactly you got stuck in the analysis, I believe you could get more specific answers. So far the above references should lead you the way already.
All the best, Martin
/****NeverStopLearning****/