Thanks TonyPH! That was my issue (well, that and it required a reboot).
To get this to work, I had to do all of the following:
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Disconnect any driver already mapped to the WDMyCloud device
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Close wd2go site (and all other open browser windows)
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I cleared out “Recent Places” in Windows 7, and deleted all my browser history
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I rebooted my PC. After doing all of the above, I still could not map the drive until I rebooted.
Once I rebooted, I was able to add the network drive and enter my credentials (username, not email, and password set through the drive’s user interface).