Have you added the users as Project Admins? When you create a user that is not a project admin and go to the Kanban board that option is greyed out. Per the Releasing a version knowledge base article you will need to have the JIRA 'Project Administrator' permission in the project(s) whose issues are to be included in the version.
As Jordan stated you can make changes to the permissiosn in the project under permisisons.
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