How to know wifi password - D-Link Tmobile Hotspot Tmg5240 Wireless Wifi Router

The wifi password is set internal to the router by the router's administrator. If that was you, then you are saying you've forgotten the password. If that is NOT you, you are asking for the password. You must get that from the administrator of the router. If you have a used router, it may have been previously setup by another admin and you are trying to access it. If the previous administrator left the unit in its default state, it can be accessed at IP 192.168.0.1. The default user name is to be left blank, and the default password is admin (lower case). If that doesn't work, you ay have no choice but to reset the router to get it back to defaults so you can gain access to it. There will be a reset switch somewhere on the unit (usually accessible thru a small opening) that you must press and hold for a period of time. Be warned that this will erase all custom setting in the router and will require a new setup, but will allow you to regain access using the default user name and password.