Welcome to the TH Community, @Deb4!
You can easily perform the formatting/erasing procedure
through Disk Management in Windows by deleting the volume and then creating a new one.
Another alternative would be through the
WD Drive Utilities For Windows that allows you to register the drive, set drive timer, run diagnostics, and perform a Drive Erase.
Hope these KB articles help you with the step-by-steps.
Keep in mind that formatting/drive erase wipes all the files from the external WD My Passport.
Let me know if you have more questions!
Cheers,
SuperSoph_WD