How do I Create an Instant Messaging App?

MIT App Inventor Help
1

sorry good morning in Italy how can i create with mit app inventor an instant messaging app like i do plz

2

See here-
https://appinventor.mit.edu/explore/ai2/clouddb-chat

3

just this ?????????

4

please help me i would like to develop an instant messaging app not sms but i don't know how to create it someone can give me directions thanks to all those who help me

per favore aiutatemi vorrei sviluppare un'app di messaggistica istantanea non sms ma non so come crearla qualcuno puo darmi le indicazioni grazie a tutti quelli che mi aiuterando