Reminder: please do not respond to bots. If you do, we cannot nuke them without messing up the database. Report them to staff and we'll take care of it.
How to post? Well, if you are asking about making threads, then you do: Go onto a forum from the Forums link on the right. Then, after entered any forum look somewhere at the top-right corner to see "Post thread". Click it and make a thread.
And if you want to reply to threads (Post), then you enter the thread (Click on the thread while in any forum) just look at the top-right corner again and then click "Post reply". Make your reply