I'm having trouble with adding characters to the campaign so everyone can play. I am the DM. I created everyone's characters. How do I share the characters and add them to the campaign? Right now when anyone clicks the link they only have the option to create a character. I am able to go to the link and add characters to the campaign, but it shows me as the player.

It's a bit counter intuitive. You have to go to the campaign join link, add the characters you want them to play and then they can "Claim" them from the campaign page.

Edit: You have to unassign the characters so other players can claim them.

Thanks! That worked