Click the "scales" at the bottom left of their message window. You'll get a new window where you can good or bad rep. A red dot will show if they check their reputation, they'll see it there. I gave you a bad rep to show you what it looked like. But I'll give you a good rep tomorrow.
"racism is dead, it died when MLK walked on a bridge and freed the slaves. Now we have a socialist Kenyan president who is not an American and if anyone mentions race they are a reverse racist (while racism is dead, reverse racism is alive and well.) #whattheyteachyouatfox"