Why can't I add appointments to my iPad calendar (iOS 8.1.2 software)?

[iMore Question]

I cannot add or change any appointments on my Ipad. Have not changed the software - all calendars on "on" and "show"

 

[kch50428]

Re: Can't add appointment to Ipad calendar - have IOS 8.1.2 software

iCloud: Troubleshooting iCloud Calendar - Apple Support