how to use variable fieldx_desc

[Asterix_ita]

I would like to use the description of fieldx (user profile fields) in the postbit vbulletin4

I tried with (vb: rawphrase fieldx_title) directly into the template but does not feed perhaps that is not a phrase of type global

I tried using a plugin

$a = $vbphrase['field5_title']

and call the variable $a, works for the other sentences but not for those fieldx.

some of you I can 'help?

Thanks for any help