Exit the settings menu and press Select on the VitaShell home screen. A message should appear with your Vita's IP address and port (usually 1337 ).
This is an increasingly common issue as modern routers default to faster frequencies. The PlayStation Vita contains an older Wi-Fi card that only supports the frequency band. It cannot see or connect to 5GHz networks. vitashell ftp not working
VitaShell requires FTP.