Following instructions on this list, I went to files-->Function files --> On local machine. This popped up a set of (unchecked) check boxes. I checked all of them, then closed that popup. I went to the menus, found nothing. Went back to "On local machine" and double-clicked the "tramolin" option. Aha, the desired function starts. i selected "BOTH" as the (existing) series name and "BOTH_tra" as the "save to" name. Clicked OK, got error message (below). Went back to the tramolin popup and clicked "Help"; the only thing that suggests possible problems is that you must have TRAMO installed. I do in fact have TRAMO installed.

The shell command is not activated.
*** error in function tramolin, line 56
> ! del /Q *.t && cd C:\Documents and Settings\teacher\Application Data\gretl\tramo && "C:\Program Files\tramo\tramo.exe" -i sername -k sername.ser && cd C:\Documents and Settings\teacher\Application Data\gretl\tramo\graph\series && echo "ser_adj" > sername.txt

Thanks TMN