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No canto superior direito de qualquer página, clique na foto do seu perfil e em Configurações.

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In the left sidebar under Organization settings, click the name of your organization.

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In the left sidebar under Developer settings, click OAuth applications.

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Click Register a new application.
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Under Application name, type "Jira".
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Under Homepage URL, type the full URL to your Jira instance.
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Under Authorization callback URL, type the full URL to your Jira instance.
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Click Register application.

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Under Organization owned applications, note the "Client ID" and "Client Secret" values.

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Vincule a sua conta do GitHub ao Jira. Para obter mais informações, confira a documentação de ajuda da Atlassian.
 
Further reading
- "Integrating Jira with your personal projects"
 - Connect Jira Cloud to GitHub (Atlassian documentation)