Let Me Report People In Champion Select

Well I have no pictures, to show exactly what I am talking about, but I have stories. I was just in a lobby and got trolled by someone picking a champ. Here's the whole story, IF it matters.

I got ADC, and I picked my intended pick, which was Ezreal. My Support then chooses Ez. He if first in pick order, so he can get Ez before me, even though he was assigned support. He then tells our jungler "Can you Not Go Lucian jungle?" I said "Can You Not Go Ez." He starts talking about how thats his support and hes gonna choose him, so I ban Ez. He chooses Ashe, I ask jungler to trade with me, and he does. I choose hecarim, and than Ashe changes her summoner spells too Smite And Flash, to troll me. I was ready to switch sum spells, to become support, but our teammate dodge, and probably had to wait, even though he was a HERO...

So thats that story, on another note, I couldn't find this little Em Eff'er on my recent players list, and I have no way to report him. So I decided to come here. PLEASE ALLOW ME TO REPORT IN CHAMPION SELECET!!!!!!!