Modify the Create a ticket screen

To all,

I am trying to remove the "Describe the Issue" display on the screen 

where a ticket is created. I went to /****/share/html/Ticket and looked
around to see what I could recognise. I found where everything up to the
"subject" is set up, but after that, it looks like it goes straight to
Custom Fields. Can anyone give me some direction on how to remove the
"Describe the Issue" line AND box from the Create a ticket screen? Thank
you in advance.