How to block people from using your wifi for TP-Link router without root for Android using Tether Official TP-Link app

We are often asked by our annoying friends, neighbors, relatives for our wifi password. We sometimes don't want to share it with them but we have to. So now you wish to somehow block them or block some other users who got into your wifi. But most of the tricks require a rooted Android device. So I have a solution where you can block as many people as you want from your wifi without rooting your device that too using the Official TP-Link app 'Tether'. The app is available for free in the Google Play Store. Just head towards the Google Play Store in your android device and search 'Tether' (without the quotes) or click here.

Click on the first app and install it.

Now open it and it will show you the wifi router it is connected with.
Note: You should have a TP-Link router.

Click on the router shown and it will ask for credentials.

By default (if you haven't changed it) the username and password both are 'admin' (without the quotes), now click on login.

You can see all the devices connected to the wifi at that very moment. You can click on any device to get more information on it.

Here you can see the option to Block the device, just tap on Block and the user will be blocked from your wifi.

 Now the device will not be shown any more on your screen. Congratulations, you have successfully blocked the user. Hmm, so now you regret and want him/her to let use your wifi then don't worry you can very easily unblovk them as well.

Click on the yellow circle in the lower right corner of your screen and just simply select Blocked Clients.

Here you can see all the devices you have blocked, just tap on the device you want to unblock.

Now just simply click on Unblock and *woof* the device is unblocked and now he/she can use your wifi now.

Now you can see the device back on your screen.

Great, now you have successfully blocked/unblocked a device without rooting your device.