Helping someone create a character with my DnD beyond account.  I would like to put the character made as a character in my Campaign.  How do I do that?

So you want to put a character made on your account in a campaign that you made on the website?

If so, on the campaign page is a link in the top right corner that you sent to your players that they follow to join the campaign.  Just copy and paste the link in the address bar of your internet browser and follow it.  You will be prompted to add one of your charcters or make a new one.  Add the character you want to.  If the player has their own D&D Beyond account, you can unassign the character in the campaign and if that player joins the campaign through the link they can take the character.

Thank you