Inviting Participants

I'm new and I can't make Zoom to work.  I'm the host and I sent the "meeting ID as well as the password" to my invitees via messenger (via messenger because most of my supposedly invitees have FB messenger account).  They logged on and they said, they had a response as "meeting going on" .  I don't know  what I did as the others cannot get in too.

Maybe it's a simple solution, Please help!

Thanks,

Anoling