Missing + sign on iCalendar

I have an iPhone 3GS which I upgraded to iOS 5. Afterwards, the + sign on the calendar application or the feature that will let me add a new message or calendar alert is missing. The result is, I cannot add another entry in my calendar but searching on Google helps me resolve the problem. Google advised me to turn the iCloud calendar feature on but I do not want to do it using iCloud. Is there any other way or any alternative for this? Any suggestions will be appreciated. Thank you.
