R350 reset issues

[Apples234]

Our R350 was reset using the button on the back.

It is now broadcasting a Configure.Me-x network. I have connected to it via the standard IP and followed the instructions to set up. It says it was successful but just continues to broadcast Configure.Me-x and will not connect to the internet (wiping out half our house).

The other two routers in our house (same model) are working as normal and connecting to the internet via our normal network.

Can anyone advise how I get the problematic router back onto our normal network following a reset? Sorry, bit of a novice so please feel free to talk to me like a five year old!