I'm going to help you practice.
The premise of this thread is homosexuality.
Alright, once you've figured that out, here's a few steps to follow:
1. Click on the gay discussion thread.
2. (there's no need for scrolling) Click at the top of the page on the "[Post a Reply]" icon.
3. Type whatever you like in the comments section.
4. Click inside the box titled "Options" and type the word sage, all lower case.
5. ???
6. Sage the gay away from /pol/.
7. Profit.
Now you try.
I did leave out some pertinent instructions.
After you've typed you comment and typed "sage" in the options box:
5. Click the box next to "I'm not a robot"
6. Accomplish whatever free labor task reCAPTCHA gives you.
7. Click on the post box.
8. ???
9. Sage the gay away!