Editind a DNS in WHM

Hi,
I'm new to this hosting stuff and am having a little trouble with setting up my clients with bigmailbox.

In WHM in which one of the fileds do I have to change th DNS entry. I'll show you what I have right now. How long does it take propogate? 24 to 48 hours as well? Cuz it doesn't seem to be working.

Thanks,

Sam

 

 

 

 

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