It is a little hard to tell what you are doing as there are many ways to do things, but I will take a guess at one.
If your blink show is a program of a few sequence, let say it takes 35 minutes to run. You tell the scheduler to start at 5:00 and repeat it until 10:00. That means that it will not restart the program after 10:00, but if the program had started at 9:55 it would continue to run for its 35 minutes and would not end until 10:30. If you had your second event is scheduled to start before 10:31 then it would never run, with out resetting the timers.
You can customize your screen layout, but on the default screen the channel test button is near the upper left corner. (like Rick said) You would have the save icon, the max channel count, then a white box with 2 check marks. Click that box and it will bring up a window that will allow you to manually control any of your channels. Be sure your dongle is connected and no show is running before clicking on it.
Hope that helps some
-Jeff