Unable to change text for email template

I am trying to change the text for an email template. I have gone under the Workflow Activities tab, expanded the EMail Notification, Selected the Edit button and clicked the Email Template name. It brings up the Template Type (notification), the subject and the body (HTML). Editing the text appears to work but it doesnt actually save the changes. Im not sure if its the way Im accessing the email template, if its a rights issue or something else.

Any help is appreciated.

LK