How to add an extra powerline adapter to the existing poweline network with pair button?

In this scenario, Powerline adapter A and Powerline adapter B form a HomeplugAV Network, Powerline adapter C wants to join this network.

The following steps are suitable for:

TL-PA211, TL-PA201, TL-PA210, TL-PA111, TL-PA101

Step 1 Press and hold the Pair button on Powerline adapter C for 3 to 8 seconds.

Step 2 Press and hold the Pair button on Powerline adapter A or B for 3 to 8 seconds. (This step must be taken within 120 seconds after step 1 is finished.)

Step 3 Wait for about 60 seconds while your Powerline adapters are trying to connect. The Power LED on Powerline adapter A/B and C will stop flashing and become solid light when the connection is made successfully.

The following steps are suitable for:

All Powerline adapters except the models mentioned above.

Step 1 Press and hold the Pair button on Powerline adapter C for 1 second.

Step 2 Press and hold the Pair button on Powerline adapter A or B for 1 second. (This step must be taken within 120 seconds after step 1 is finished.)

Note: The sequence of step1 and step2 mentioned above can be exchanged.