I've been trying to add a contact to a received email in GW8 using the instructions from the user manual (see below). But when I close the email the added contact info is lost. Any ideas

Adding a Contact to an E-Mail You Receive
When you add a contact to an e-mail you receive, the e-mail is then associated with the contact you
added. This is helpful when viewing the history for a particular contact, because the e-mail displays
in the contact history for the contact even though that contact did not send the e-mail. For additional
information on contact history, see Viewing All Correspondence with a Contact on page 194.
1 Open an item from your Mailbox or Calendar.
2 Click the Personalize tab.
3 In the Contact field, type a user name, then press Enter. Repeat for additional users.
To select user names from a list, click Address Selector icon next to the Contact field. Doubleclick
each user, then click OK.I can insert email address but it doesn't save with the email