(Dave said)
for me I start evince then pull down the help menu
and then click on help then scroll down to interactive forms
and click on "forms"
(Fred said)
Hmm. I see. Try that left-most item in the top bar and see if
it gives you a menu that includes "Help". screenshot attached.
(Samuel said)
Look higher. It's in the menu on the Gnome panel at the top
of the screen.
Samuel gets the cigar!
Evince just won't let me edit this form. I think Samuel's June 05 post
is correct:
It's likely the new proprietary Adobe form.
Nothing except
Adobe's newer reader will support filling this form in.
An that new reader is not available for Linux.
I've marked this thread "CLOSED". I thank everyone for their efforts.