Hello Vardi,
Welcome to Atlassian Community!
I can see that you are using Jira Software Free, so all users added to the site on the group jira-software-users will be administrators on projects.
If you want users to show on the board, just assign a ticket to them, so their profile pictures will appear on the top.
If you have any other questions regarding this matter, please let us know.
Regards,
Angélica
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