\r\n1) Edit it how?\r\n
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With an editor.

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\r\n2) Define "appropriately".\r\n
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In the case of /etc/fstab: you'll need an entry for each mounted partition. This would include the device file, mountpoint, filesystem type, mount options, and dump/pass values.

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As a practical matter, I'll assume you largely keep your partitioning intact (I'd recommend: /, /boot, /tmp, /usr, /var, /home, and possibly /usr/local or others). Just make sure the device files correspond the the partition numbers on the new system.

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I'd hope that's relatively clear. Rick dives into the details.