This question is in reference to Atlassian Documentation: Customizing your project
Without more information about your permissions, it seems that you don't have the correct permissions to make this change.
Ask your administrator to check that you have the correct permissions.
Here's some doc to help you get there: https://confluence.atlassian.com/agile/jira-agile-user-s-guide/configuring-a-board#ConfiguringaBoard-Changingaboard'sadministrators
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