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

I have had 'garden web' log on book marked on my lap top for well over 20 years. It will not let me log in. I get a 'check your filters' message. For a few weeks if I just kept clickin on the 'sign in' the bell would appear (even when it said I could not log in) and I was IN and could through the bell get to my posts and then onto the sites with in Houzz I like to read. Now nothing. I can use my log in through the Houzz icon on the top left, the bell appears,I can read the subjects as they come down but if I click on one to go to that thread POOF I am no longer logged in and cannot comment. IT'S MADDENING. I am here on an account from my work google account. I am logging on on my lap top from home. NO ISSUES!! This is not ME this is a HOUZZ issue. I have been offered NO HELP and yes I have emailed directly over it. All I get is a standared "check y our blah blah blah' !!