Airport Extreme connected drive does not appear in Time Machines drive list

I have two Macbook Pros. Both have 500GB hard drives. I have an airport Extreme with a WD terabyte hard drive and a HP printer attached via USB cable. Both Macbooks can access the WD HD & internet.
One MacbookPro has time machine set up to use the Terabyte HD as backup.
I want the other MacbookPro to also use this terabyte drive for backup.
But when I try to set up Time Machine to use the drive, the drive does not appear in the backup drive list.
What can I do to fix this? I had a HD crash on the non-backed up Macbook recently. I desperately need it to be backed up!
Any ideas?

Does the drive show in Disk Utility? Try a restart.

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