@Franco05 

First this is to make sure the extender is communicating with other devices such as a phone or computer.  This will confrim the network is there and can be accessed by devices.  Once this is confrimed you would need to look at the TV's settings on its network settings.  Make sure the network card is enabled.  Also make sure that the band the TV can connect to 2.4 GHz, 5GHz or both are enabled on both the RE and the TV.  Start with that and let us know