When you click on a subject line there is a section at the top for either a new post or reply, one of the two small green boxes.
If you hit the new post box you have to write something in the subject line, if you are just responding you don't.
If you want an avatar (mine is the Ass family, you know, Wise, Smart, Lazy, Dumb, Jack) click on the word "profile" look at the top and find "avatar" then just follow the instructions and upload your photo.
If you want to post a new topic and make it a poll click the add poll line at the bottom of the page (its teal).
If you think this is all self explanitory and I'm giving too much information, then I'm not writing this for you

....you're smarter than me because these are questions I had to ask or research.
After you have posted you can edit your message by clicking the very small and hard to read "edit" button on the top right of your post.
| Quote: |
| To quote something someone else said, copy and past it, then highlight it and click the "quote" (thought bubles) box. |
If you think of more let me know.