Storing data of an alarm settings

I am making an alarm app. Now I want to know how can I store the alarm settings save in my app. I have a little knowledge of NSUserDefaults. My problem is that I don't know how to give a unique id to each alarm e.g. if user select the same settings for two alarm than delete alarm one alarm than both the alarm would be deleted.I don't know how to use sqlite. So any suggestions or code ??
Thanks