How do you configure DNS data for a subdomain?

Hello all, I am making an attempt to configure DNS data for a subdomain and I am not fairly positive the best way to do it. Can anybody stroll me via the essential steps and supply some steerage? Particularly, I am utilizing a website registrar that permits me to handle my DNS data, and I might prefer to arrange a subdomain for my website. Any assist could be drastically appreciated. Thanks!
 

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