Ways to sign in
This site uses passkeys instead of passwords. A passkey lives in one place you choose; you confirm it there with your face, fingerprint or PIN, and this site keeps only a public key. Pick the place that suits the device you are on: this site treats every option the same, and none is required.
This device
Good for your own laptop or phone.
You need Windows Hello, Touch ID, or an Android phone or iPhone with a screen lock. Apple and Google may copy it to your other devices through iCloud Keychain or Google Password Manager.
Linux desktops usually have no built-in place for passkeys; use one of the options below there.
A password manager
Good for Linux, several computers, or keeping passkeys off a personal device.
You need a password manager that saves passkeys, with its browser extension installed: the extension takes over the browser's prompt. For example Bitwarden (or a self-hosted Vaultwarden server), 1Password, Proton Pass or KeePassXC (open source, kept on your computer), or any other that saves passkeys.
Your phone
Good for a computer that is not yours: the passkey stays on the phone.
You need a browser that shows a QR code to scan, Bluetooth on the computer, and the phone nearby.
Not every browser offers this, and virtual machines usually have no Bluetooth.
A security key
Good for administrators and shared computers: the key never leaves your hands.
You need a FIDO2 key that plugs in by USB or works over NFC, with a PIN set on it. For example YubiKey, Nitrokey, Google Titan or SoloKeys, or any other FIDO2 key.
Keep a second one
After you sign in, add a passkey in another place from Your passkeys, for example your password manager and a security key. If you lose your only passkey you need a new invitation from the person who runs this site.
If nothing works here
Open your invitation on another device or browser that offers one of these options, or ask the person who runs this site. If they set up single sign-on, the sign-in page offers it too.