HP 8100C - Manual (Page 41)

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Changing or deleting addresses in lists
Use this procedure to change or delete e-mail addresses from a
distribution list in your Personal E-Mail lists book.
While in a selected distribution list, you can change the information
for an e-mail address contained in the list, as long as the address is
from your Personal E-Mail address book. When you change
information for an e-mail address from your personal book, the
address information will be updated in Your Personal E-Mail address
book and in any distribution list in which the address appears.
If the address is from the Public E-Mail addresses book, you can
delete it from your distribution list, but you cannot change information
in that address. Contact the administrator to make those changes.