If it's your first time as a champ and in a role...

Warn your team. That would go under refusing to communicate.

In the lobby would be best, so they can kick you If they don't want to deal with that. Go try new things with a full team of friends, not strangers who don't like getting thirty minutes wasted because you just couldn't stop pretending you were Riven as Lucian bot.

EDIT: You guys are a bit angry... Do you not have friends? It's not hard at all to get a five-man premade. Or even just find people online willing to help you out.

Just, do that instead of trying your new thing without explaining._ Explain and they keep you, that can happen too. But don't explain and do poorly, that's all on you. _