Open registration. Your account activates once you verify your email.
Paste the contents of your public key file, usually ~/.ssh/id_ed25519.pub. It starts with ssh-ed25519 or ssh-rsa.
~/.ssh/id_ed25519.pub
ssh-ed25519
ssh-rsa
Run this, take the default path, and paste what the second line prints.
ssh-keygen -t ed25519 cat ~/.ssh/id_ed25519.pub
Create account
Prefer the terminal? ssh git@gitbay.org register --username you --email you@example.org
ssh git@gitbay.org register --username you --email you@example.org