This article describes how to block/unblock devices from connecting.
INSTRUCTIONS & INFO
From the Elevate Manager, click Wi-F user. Note: Whenever you block or unblock devices, the Wi-Fi radio resets to activate the new settings. Any devices connected to the mobile hotspot will be disconnected when the Wi-Fi radio resets.
Next to the desired device, click the Block checkbox.
To unblock devices, from the homepage, click Advanced settings.
Click MAC Filter.
Click the Delete button next to the device you wish to unblock.
Click Ok to confirm.
If prompted, click Ok to restart Wi-Fi. Note: This will temporarily disconnect all Wi-Fi users.