Once you have added publications to your Publons profile a Metrics tab will be accessible on your profile. This section of your profile does not have to be shown, you can toggle it on or off from your profile settings.
Your “Publication metrics” shows a handful of metrics derived from your publication history.
“H-index” is repeated from your profile card
“Sum of times” cited is also repeated from your profile card
“Average citations per item” is calculated using your “Sum of times cited” and the number of your publications which are indexed in Web of Science.
“Average citations per year” is calculated using your “Sum of times cited” and the number of years between your first Web of Science indexed publication and your last.
Please learn more about your h-index here.