Hi Sara, were you wanting to invite people who are already network members to connect to you, or people outside the network?
To invite people who aren't already network members, you need to use the 'tell a friend' form. Just go to the 'invite a friend' page (there are links in a couple of places in the site, but the easiest way is to type this: " /invite " (no inverted commas or spaces) at the end of the site URL, so it will look like this: http: //www.bcna.org.au/ invite.
Then follow the instructions by typing in the email addresses of the people you want to invite, click send, and they should receive an email with a link they can click on to join.
If that's what you did and it didn't work, just let me know. Or, I'd be happy to talk to you by email or phone -- you can find my contact details by clicking my username and they're in 'My story'.
Di