One question:" have a way to write a fixed head or feet post???" I must write alway Mrbraun Web Site and bla bla bla ?? 
TNX 
Click on Member Profile at the top of the page. Then click on View/Update profile. There is a place in there to include a signature. That’s where you place things that you want to show up on the bottom of every post.
(It looks lke you already do it… so perhaps I misunderstand the question)
Tnx Kaz for the tip !!