Activate 'Request Closure Code' on ticket resolution

Activate 'Request Closure Code' on ticket resolution

Hi Team,
 
We would like to start using the 'Request Closure Codes' when resolving tickets, but I cannot locate the setting to turn this option on.
 
Can you please advise how to activate the closure codes and how to add the field to the ticket template?
 
Thank you
 
Amanda

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