How do you remove your rank?

I'm done with rankeds.

I hated it before and I always will. Last year my placements matches went horrible and I got placed in Silver4. I was too lazy to grind rankeds afterwards. Now I got the sudden urge to play all placement games in a day and went 8 wins and 2 losses. 3 of my teammates in my last game had a gold border and we won that game too. I got placed Silver5.

How do I remove it to be unranked again to not embarrass myself when people look me up on Lolnexus?