Have airport extreme, square model, have a external harddrive to use as back up(formated for mac)hooked it up to the usb port in back. can't find it on my computer. what am i doing wrong

have the airport extreme, square model. have a external harddrive formated for mac hooked up to the usb port in back.
i can't find the harddrive on the computer for back up in timemachine. what am i doing wrong?

First, if you are not aware, you need to know that Apple does not officially support Time Machine backups to a drive at the USB port of the AirPort Extreme.
That may be part of the problem here, so if you want to continue to try this, you need to understand that there are no guarantees of success.
Some users do seem to be able to make this work, but most have some problems and some....like me....have nothing but problems when they try this.
If you want to continue to try this, the first thing to verify is that the drive is formatted specifically in Mac OS Extended (Journaled). Have you verified that the drive is formatted correctly by connecting it directly to your Mac and using Disk Utility to check?
Some drives that are advertised as being "compatible for Mac" are not formatted correctly in Mac OS Extended (Journaled). Time Machine has no chance of success unless the drive is first formatted correctly.
I would also ask that you consider leaving the drive connected to your Mac for Time Machine backups. That will be supported, and is a far more reliable way to keep backups if your data is important to you.
Next, we need to know what operating system you are running on your Mac. If you do not know, click the Apple icon in the upper left corner of the screen and then click About This Mac.  Post back with the OS X Version number that you see there.

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