I've forgotten the password to my mtn wifi

I have been trying to change the name and the password of my MTN broadband but the providedlink keeps asking for username and password which i don't know where to get those...

I've been trying to log in into my Momo app but I've forgotten my pin.

I just bought a MTN MIFI and the WiFi Icon isn't turning on and it's not being discovered by any device I clicked the WiFi button and hold but it didn't work I connected to a...