its a little tricky, and you have to knock a decade or two of dust off your HTML skills.
Save the script of your figure, make sure you have edited the text that you want to change.
Then go in to the script and add good ol'e markup to <I>italicize <I/> the text. Check the scripting index for MARKUP and to find examples.
//open Big Class.jmp and run this
obj=Graph Builder(
Size( 570, 490 ),
Show Control Panel( 0 ),
Variables( X( :height ), Y( :weight ), Group X( :age ), Group Y( :sex ) ),
Elements( Points( X, Y, Legend( 2 ) ), Smoother( X, Y, Legend( 3 ) ) ),
SendToReport(
Dispatch(
{},
"graph title",
TextEditBox,
{Set Text( "<i>italic</i> vs. normal" )}
)
)
);
go= report (obj) [texteditbox(1)]<<markup;
JMP Systems Engineer, Health and Life Sciences (Pharma)