1. BLOCK A DEVICE: From your device's web browser, go to http://attwifimanager. Enter your Username and Password, then click SIGN IN.
   Note: Ensure that your device is connected to the Netgear Nighthawk's Wi-Fi network. For more information, please see the Connect Devices to Wi-Fi or Connect PC or Mac to Wi-Fi tutorials.
   
2. Click SETTINGS at the top of the page.
   
3. Click Security, then click Access Controls.
   
4. Select the Enable checkbox.
   
5. Ensure that BlackList is selected under Filter Type.
   
6. Click ADD under BLOCKED DEVICES.
   
7. Enter the device's Name and MAC Address. Click ADD. 
   Note: To add a device that is currently connected to the network, click the Add icon then click the desired device.
   
8. Click Apply when finished.
   
9. UNBLOCK A DEVICE: From the Access Controls screen, click the checkbox next to the desired device then click DELETE.
   
10. Click Apply when finished.