It's also possible right on the unit. Here it is from the manual:
By default, Scan Lists are named “Scan List 01 - Scan List 20”. If
desired, you can give your Scan Lists names to describe their
function. Press PGM, then press the GLOB softkey and scroll
down to the Scan Lists parameter. Press the SEL key to display
the Scan Lists sub menu. Scroll to the desired Scan List and
press the -> key to edit the settings for the selected Scan List,
Scroll to the Tag field and press the -> key to edit the name.
Press the Done softkey when finished, then press the Save
softkey to save the changes to the Scan List sub menu, then
press the Save softkey again to save the changes to the Global
menu.
Hope that helps!