After an Expression Function has been registered in Spotfire, and listed in the function list, you can change the name of the function, you can edit a previously registered expression function.
In TIBCO Spotfire, select
Edit > Data Function Properties (G)
Response: The Data
Function Properties dialog is displayed.
Click on the Expression Functions tab.
Click on the expression function that you want to edit.
Click Edit...
Response: The Expression
Function dialog is displayed.
Make the required changes in the Expression Functions dialog.
Click OK.
See also:
How to Create an Expression Function.