Jahidbg wrote

Please check & solution 

Hello @Jahidbg, can you please describe the issue in detail? Do you mean you cannot open the forum thread on the phone? Or do you mean you are not able to login to the router via the Tether app? 

Please note that the login username/password is the same as the local password when logging into the web management page. It is not the password of TP-Link ID or Wireless Password, but an administrative password created when you set it up for the first time.

If you cannot remember any password, please try the default username/password which is admin/admin in lower case, however, if it still doesn't work, please reset the TP-Link device by pressing and holding the reset button/hole of the router until the Power LED binks to reset it, then set it up again from the beginning via web management page or Tether APP.