How do I change the users quantity in Real-word Schedule by test,By Number



ALM Performance Center Vesrion : 12.00

How do I change the user’s quantity in Real-word Schedule by test, By Number?

Because, users filed is disabled, and as soon as i design the scenario in the Global Scheduler, its assigns the users automatically.

For Ex: I have designed scenario useing real-World Schedule by test, By Number for 452 users for 196 scripts.

It automatically assigned the No. Of users for each script irrespectivly.Most of the scripts assigned 0 users. And for some scripts 91 users like that.

There is no way to modify the users.

How do I do that?
I can modify the user quntity by selecting the Real-world schedule by test, percentage mode.

Please advise me, tomorrow I have to kickoff the test for 452 users.