First of all, you may have noticed I moved the topics you started in the forum "For our English friends".
I created that section a lot of years ago when almost everybody here was Spanish and we had just a couple of English members.
Anyway, that was too long ago and just now we are almost half and half, and there are posts in English and in Spanish mixed all around the place.
I also created this section here dedicated to mod httpBL a couple of years ago and (as you can see) there are already more questions here about it.
Now, going to the point, the problem is it seems your server hasn't got the
iconv module installed, so it cannot find the iconv() function.
It's a pity because you need that function to be able to see properly the help section of mod httpBL. I didn't know some servers didn't have that module installed. I thought it came by default with every installation of PHP.
I will try to find another PHP function to do the same.
In the mean time you can try this small trick:
Look for the file httpBL_Config.php inside the Sources folder of your forum.
Inside it look for the lines:
if ($context['character_set'] != 'UTF-8')
$httpBL_skype_text = iconv("UTF-8", "ISO-8859-15", $httpBL_skype_text);
Replace them with:
//if ($context['character_set'] != 'UTF-8')
//$httpBL_skype_text = iconv("UTF-8", "ISO-8859-15", $httpBL_skype_text);
Doing that, it won't use that iconv function and hopefully you will be able to see the help page, even if it has the wrong language encoding.