Znuny Open Source Ticketsystem

Dizzy, Thanks a lot for your answer. ;)
It's true, i can add news combobox or something like that,now my situation is that i don't know if
is there a short way to create a simple input text??
if that is possible, how do i find out more about it?
or what is the best way to begin this problem ...

I'd like to modify my otrs ticket interface. I use otrs 2.4 with Mandriva 2010.
Otrs is working but i need to add a new field in this page.
I saw into CustomerTicketMessage.pm and CustomerTicketOverView.pm perl modules but
i can't see how customer.pl file send data via POST.
I don't know what i ...