Un-remove back up drive for Time Machine use?

I need to restore a removed disk to the Time Machine menu. I was using two external drives to back up my internal drive.
One of the drives is a USB drive.  The other was a Western Digital Live network drive.  I connect to that network drive through my home network.  It plugs into the wireless router through an ethernet cable.
I wanted Time Machine to stop backing up to the wireless drive (WD Live) temporarily.  So, I removed it from the menu on the Time Machine preferences. Now, I can't get it back.
Although I can mount the WD Live drive and view its other contents, it no longer appears as an available drive for backing up with Time Machine.  I have tried deleting the Time Machine plist file from the preferences.
I am having this problem with 10.8.1.  I had it with 10.8.0.  I have the problem on my 2012 MacBook Air and on my late 2008 MacBook aluminum body.
Any suggestions?

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    Barry

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