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The best way to update any phone is to wait for the official release of the OS from the brand itself.
Samsung has promised the Android N update for Galaxy C7 Pro and Galaxy C9 Pro both so its better to wait for the official update to roll out.
However most of the time you will receive the update notification automatically but you can check it through this process manually:
To check the new update you can follow this process:
Go to "Settings"
Scroll down to "System Updates"
Then click on the Check update manually
and then let it complete the process
The second way is to root the phone and install android N based custom ROM in it.
Here is the video showing Step by Step process that how to update the Phone to Android N:
You can find the specs here: Samsung Galaxy C9 Pro