New MY PASSPORT I made a 'stupid' mistake

WD External Drives External Drives for Mac
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I bought a 1TB ‘MyPassport’ for my MacBook. took it out of the box, plugged it in and it was up and running. A window popped up stating that the passport needed to be deleted and reinstalled (-or something of that nature-) which I thought was strange because the GeekSquad person told me I wouldn’t need to do that with this Passport. Well, I proceeded as prompted. Now when I go to plug in the passport to upload all my data and to create a Time Machine - the thing doesn’t show up… at all… in any way.

What in tarnation do I do now?

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Hi,

Apple has changed the function of the Time Machine. It will prompt you to reformat the drive to APFS file format in order to use with Time Machine, and lock the drive for sole Time Machine use.

This article explains how to Convert a WD External Drive to Apple File System (APFS) Format: External Drive: Convert to Apple File System (APFS) Format