Open the web browser and type web address http://tplinkwifi.net or the IP address of the router into the address bar of browser and Press Enter button from your system.
Step 2 : Now Type the username and password in the login page that you have accessed using http://tplinkwifi.net login apge , now enter the default username and password i.e admin.
Step 3 Now Select Wireless->Wireless Security from left side menu option in order to open the wireless security page.check option if
Disable Security is checked, that means you do not set a network key on the router.
If the WEP is checked, this means that the Key1 is the network key.
if the WPA-PSK/WPA2-PSK is checked, this mean that PSK Password is the network key. in other words you can‘t check WPA/WPA2, it is for official , not for personal. If you have checked it, please change to another security type.