Sharon,
How do I edit the invitation message.
Either in the Member Notices tab of your group's settings page, or on the Invite page itself.
Every customization that has been added to the main message and it is
pretty weird. I wouldn¡¯t respond to it.
I'm not sure what you're saying here.
The invitation as sent has some boilerplate added above and below the text that you can customize. I usually put a horizontal line, or row of hyphens, at the top and bottom of my custom text to more clearly distinguish it from the boilerplate.
Shal