Hi Selina! Welcome to the forums. Sorry for the trouble, though.
Currently we can hook up to iCloud with our iCloud Reminders feature on iPhone 4S. (We don't use iCloud to sync.) Did you happen to sign up for a Sync Server account?
When you say the wheel keeps spinning, do you mean the Sync icon in the middle of our lower toolbar?
If you'd like, give us another call, or email support
here.