From another thread:
Yes, it works right away. You have to go into the app and pick your settings for each type of notification......texts, missed calls, etc.
Preference Settings:
Use Statusbar icon: select ON
Repeat mode: select Always on
Work interval: pick what hours you want the notifications to occur i.e. 24 hours a day or just during certain hours.
Time Interval: You pick the repeat frequency i.e. every 3 mins, every 5 mins.
You can also tap the wrench icon for other settings.