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Just by clicking your name at the top of the page, sending email, and clicking link to verify. I got mine instantly! Be sure to let your friends know. Try it, it's not a troll. It's League's site and your email. Not sure why it's not advertised lol but who cares, it's free IP (I know a lot of you don't need it but still, some do!).
p.s. tried to search for other threads but didn't see any. Sorry if repost!
EDIT - Thanks for the upvotes! Please bump and tell friends!
Edit2 - From email Riot sent lol
"Verifying your email address ensures an extra layer of security for your account. We know we have the correct info on file should you need assistance with your account.
This additional security is pretty important, so as a thank you for taking this step, we're going to grant you a 4 Win IP Boost once you verify your email and create your Summoner Name. Be patient - it may take up to 48 hours.
For more information on your account — please visit your Account Management page.