easy dude,.. i just a stupid man who try to solved my problem, no need to attack others.
but thank for your attention.
no offence 
Just saying, if a mod author does not bother to update a mod but instead attempts to blame the theme author for the mods malfunction, well then the mod author is just taking the easy way out.
It's like the plasterer expecting the painter to cover his mistakes. Seen it way too many times. 
dude loose the attitude and grow up not once have i said it was the themes fault get your facts strait
im the developer of the mod in question
the comment about dz themes was not from me
now i would appreicate it if you would stop attacking me and my mod i find your attitude disgusting you should no better
so just to get things strait the mod find
<div class="info">'.sprintf($txt['welcome_guest'], $txt['guest_title']).'</div>
and injects the fb login button to the template via the buffer
if this <div class="info">'.sprintf($txt['welcome_guest'], $txt['guest_title']).'</div>
isnt in the theme it wont show as simple as that most people code mods for the default theme and that is exsacly what i have done
for themes that dont have this reqires you to add it manualy wich cant not currently be done but you will be able to in the next revision