Asus RT-AC68R - Manual (Page 22)

. From the Security Level dropdown list, select the encryption
method for your wireless network.
IMPORTANT! The IEEE 802.11n/ac standard prohibits using High
Throughput with WEP or WPA-TKIP as the unicast cipher. If you use these
encryption methods, your data rate will drop to IEEE 802.11g 54Mbps
connection.
5. Key in your security passkey.
. Click Apply when done.
3.1.2 Managing your network clients
To manage your network clients:
1. From the navigation panel, go to General > Network Map tab.
2. On the Network Map screen, select the Client Status icon to
display your network client’s information.
. To block a client’s access to your network, select the client and
click block.