Invite or give players access

I've been sent or have asked for e-mails so players could join my game. I remember I once had a pass key and I looked in the forum and it said it was available under the settings tab in my campaign. What settings tab? And will giving players the pass key grant them access?

Ah, that's probably a wording problem. We changed the name of the tab from "Settings" to "Edit" to avoid confusion with campaign settings like "Eberron", "Forgotten Realms", etc.. That should say the "Edit tab". If you're the owner of the campaign, the passkey should be visible and changeable there.
Let me know if you need any help!