Sign in to the you Keeper account,, and once you have supplied your email address and clicked you will be asked to supply your fido key;

Select "Security key", insert your key into a spare USB port, then click .

You will now be asked to type in the PIN code for your FIDO key;

Enter your PIN then click;

You will then be asked to supply your master password;

Type in your master password then click and you will gain access to your Keeper account.