How can i reply post in forum ????

[faince222]

In post, i can't see reply button. WHY? 

When you not see reply button it does mean that post is locked and you can not answer. In other way, when a post is open, you can see a bottom with a simple write "Reply", press it and reply !

[aronnov]

no reply function on the forum labeled sticky, chances are you entering the forum sticky, so the reply function does not find there, please correct me if I am wrong ...