If it’s your first time using Fly.io, you’ll need to sign up for an account. To do so, run:
fly auth signup
This will take you to the sign-up page where you can either:
Sign up with email: Enter your name, email and password.
Sign up with GitHub: If you have a GitHub account, you can use that to sign up. Look out for the confirmatory email we'll send you which will give you a link to set a password; you'll need a password set so we can actively verify that it is you for some Fly.io operations.
You will also be prompted for credit card payment information, required for charges outside the free allowances on Fly.io. See Pricing for more details.
Whichever route you take you will be signed up, signed in, and returned to your command line, ready to use Fly.io.