Hello Luke,
Welcome to Atlassian Community!
When using Jira Cloud, site administrators can invite/create new users to the site. I saw that you are a site admin, so you must go to Administration > Users > Invite users.
On this page, you can add the email address, choose their access, add them to groups and customize the email invite.
If you have any other questions or face any issue, please let us know.
Regards,
Angélica
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.