Where can I submit a screenshot to provide more evidence of a report that should result in a ban?

I won't submit it here as I've discovered it to be against the rules with my last thread being deleted. This is another issue entirely, and even more trollish than the first.

This player's ADC choice was picked by the other team, so he decides to punish us by trolling, like it was our fault. See the pic I attached. I cut his name out of it so I can't be accused of the reason my last post was deleted.

This progressed into abandoning his bot lane and coming top to mine to mess with my stacks as Nasus, intentionally feeding and doing anything and everything possible to make our experience terrible because he didn't get the ADC he wanted.

I want to see some action carried out for this. It's ridiculous. This is too common of an occurrence when someone who knows there's a penalty for dodging intentionally trolls you in champ select because they know you;re stuck with them for the entirety of a game.

Also, I find his summoner name offensive. It suggests he's a veteran of the armed forces when he very clearly is not.

Am more than happy to submit the full screenshot to any Riot employee.