How do I order AutoFill suggestions when I have multiple entries for a single website?

When logging into a website for which you have multiple entries stored, AutoFill allows you to choose which log-in credentials you want to use. What if you frequently log into a site and you want a particular entry or entries to appear at the top of this list of credentials?

In order to do this, 'favourite' an entry and it will always appear at the top of the list of suggestions.