A moderator will tell you to contact support.. Then support will either tell you that you opted out of emails when you signed up for the game and they can’t opt you in now or they’ll give you a generic run around response. I speak from experience.TLDR- You can’t if you opted out of emails
I contacted support and got this response-‘I checked our resources and found out the game stats are intended only at this time to a small group of Summoners that are subscribed to our mailing list. This allows us to gain valuable data and insight into how they perform. It allows us to tweak them here and there before adding more players to the list.The distribution of the stats is random so it is no guarantee that even you subscribed, you will be able to get the email. With that said, I have gone ahead and subscribed your account email to have a chance to get the monthly account stats.‘Just have to wait and see...