Although I suspect this is a question specific to UML2 Tools, did you try:
- Select the message, then start typing.
- Select the message, then from the toolbar, select "All Connector Labels"
or "No Connector Labels" to hide or show all labels associated with
"Bruce Frazer" <firstname.lastname@example.org> wrote in message
> This must be a silly question, but after I draw in a "message" between two
> "lifelines", how to I change the visible text over the message arrow?
> I tried changing the "name" property of the message, but it does not
> My message arrows all have text more or less like: 1: *