Your game account is your Telegram account. Telegram confirms who you are, so you don't need a password.
You choose a public display name of 3 to 20 characters: letters, numbers, spaces, dots, dashes and underscores.
Your display name appears on the public leaderboard.
Your Telegram username is never shown.
Choosing a good name
Don't use your full real name, phone number or email.
Don't pretend to be PickBot or another person.