How do I send a ticket about a troll?

So, I had a game where I got autofilled top. Since I don't know how to play "normal" toplane champions I decided to pick my otp, Tristana with more ad tanky build (I played a few games with this build on toplane and the games were pretty okay, also in rankeds). When I realized our jungler Soraka with ignite and cleanse is giving the enemy team kills, I decided to stop trying and started playing for fun. I guess this guy won't get banned, since he got some kills and didn't die like 20 times so I'd like to report this guy to riot.
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