To bring up the PhoneSheriff interface on your child's Android device which you own and have proper consent to monitor, you can select the icon if the icon option is turned on. If not, you can dial your PIN, which by default is #12345* like a regular phone call on Android devices. It is highly recommended that you change the PIN from inside the Administrator Login immediately after installation.
On iOS devices, open Safari and type sheriff:// into the address bar and tap Go.
To see each of the different phone's configurations, please refer to the PhoneSheriff user guide: