In a web browser, Sign in to the your Logto account, but once you have supplied your username and password you will now be offered the option to verify your account with a passkey.
Insert you Fido2 key into an available USB port, then select the option "Verify via passkey".
A new window will now open titled "Choose a passkey", select the option "Security key";
You will now be prompted to enter the PIN code for your Fido2 key.
At the prompt "Security Key PIN", enter the PIN code, then click 
.
(in the case of a Fido key with a fingerprint reader you will need to swipe your finger on the key);
You are now prompted to touch the key (to prove you are present and giving permission for the key to be used).
Touch the necessary area on your Fido key;
Once you have touched the key you will then be logged in to your Logto account.