How to block new device from connecting tplink wifi router?

Hello, I am have a tplink wifi router and i want to block new device from connecting to the wifi router. Even though if they known the password they should not get connected to the wifi router. Only specific or certain device should be connected. For example : If one of my friend comes at my home and he s going to... show more Hello, I am have a tplink wifi router and i want to block new device from connecting to the wifi router. Even though if they known the password they should not get connected to the wifi router. Only specific or certain device should be connected. For example : If one of my friend comes at my home and he s going to connect for the first time to my router and he knows the password but after enterning password too he should not get connected.
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