To change the Telegram account linked to the Personal Account, use one of the following options:

Option 1

1. In your Personal Account, go to the Licenses section and click the Telegram button.
2. In the opened window press the button Unset phone

Option 2

1. In the Telegram desktop client, click the Settings button.
2. In the window that opens, go to Privacy.
3. Click the Active Sessions link and delete session ChatApp.

Option 3

1. In the Telegram your phone, click the Settings button.
2. In the window that opens, go to Privacy.
3. Click the Active Sessions link and delete session ChatApp.