To take a profile off a CloudiKids, choose "Remove from CloudiKids" on the profile in the app. To delete a profile, tap "Delete". What you do depends on whether the profile is on a CloudiKids.
A profile that is on a CloudiKids
In the app, choose Remove from CloudiKids on the profile. This takes the profile's content off the device; the profile stays in the app, and the position is free for another profile. To delete the profile altogether, tap Delete, which appears after you have removed it. The app first shows a warning that deleting the profile cannot be undone.
A profile that is not on any CloudiKids
From the home screen, select the profile, tap the pencil icon next to its avatar, choose Delete this profile and confirm.
To put a profile on a CloudiKids: How Do I Transfer a Child's Profile to CloudiKids?