How do I sync icloud with my imac?

I have changed my some addresses and phone numbers on my address book on my iPad. Then I backed up the ipad to icloud.  Then how do I get that same icloud information onto my address book on my imac?  You would think that it would go there automatically, but it doesn't.  I can't figure out how to sync them all together.

 

Thanks!  Maggie

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