This article will show how to change the network security key on a Tenda AC15 AC1900 wireless router.Here is how to do this:1. To get to the settings of the Tenda AC1900 to change the network security key, connect to the router by going to 192.168.1.1 in your browser. Sign in here with the current router password to sign in. 2. Once signed into the router, a menu will appear on the left side of the screen. Select Wireless Settings. 3. To the right of the menu, this screen will now update to show new options. Select Wi-Fi Name and Password. 4. This option will bring up a new menu, which will list the current Wi-Fi name and password of the router.The default settings for both of these settings can be found on a sticker on the back of the router. 5. To change the password, clear the current password and enter a new one. The router will require this password to be at least 8 characters. 6. Another setting option is to have no password. This will allow anyone to connect to your network just by simply selecting it on a wireless-capable device. 7. When changes are complete, click Save and a Saving... window will appear. Once finished, the router will need to reboot and any wireless devices will need to enter in the new password (if necessary) to connect again.