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Contact — League of Legends
Corrections are the most useful thing you can send.
How
Reach the site
Post in the forum. It needs a free account, and it is read. Say which page, what it shows, and what you expected. A link to Riot's own patch notes makes a correction quick to check.
Useful things to send: a build or rate that looks wrong, a champion or item missing after a patch, or a tool that breaks.
Rights
Takedown requests
If you hold rights in something shown here and want it removed, say so in the forum with a link to the page. Requests are acted on promptly.