On the main page it will say start a conversation. ..click it. Than type in your subject which must be 15 or more letters...than type in the body of your message than click next...here you must choose at least one place for your thread to goto. I scrolled down and found kitchen table and clicked it..than I clicked post. ..do not assume that just brcause your at the KT when you start your thread that it will show up here...it won't unless you choose the KT.

well, finally! I can't post with my android phone or with the ipad using safari.

@David Chang comment