How to set up WiFi and WiFi password on my android phone using boost Mobile network

[1beatrice]

I'm trying to setup Chromecast on my TV which it is plugged into my HDMI but I can't get connected

 

[webworkings]

Have you tried the Chromecast Troubleshooter? https://support.google.com/chromecast/troubleshooter/2995236/?hl=en