If you are talking about the 2 piece stainless trim that goes around the screen, then it is normally held in place by the windscreen adhesive, so it is pressed into place carefully before the glue sets!
I would not think that you could now press it into place now if the screen has already been glued/sealed, unless there is room to push it into place, then you might be able to put a bead of sealant into the channel & then press the trim in.
Tony
<font size="1">1981 TR7 FHC Cavalry Blue
1980 TR7V8 DHC Jaguar Regency Red - sadly sold!
1977 TR8 FHC EFI Factory development car Inca Yellow</font id="size1">