Basically you're administrator to projects in Jira that means you can do the configuration with in your projects. From screenshot it is visible that you are project admin and not a jira admin.
A jira admin is responsible for complete management of Jira instance like creating projects, creating users, creating groups, workflow creations, screens, custom fields etc.
For group management, you need to have jira administrator permissions.
Learn how to use two new reports for next-gen projects in Jira Cloud: Cumulative flow diagram and Sprint burndown chart. Ivan Teong, Product Manager, Jira Software, demos the Cumulative ...
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