Help needed to find password

 I have just ( after much effort ) loaded a WD icloud hard drive and now trying to link it to my imac as a back up on time machine. However it rejects the password I set up for the wd icloud. I have checked the imac keychain and cannot find it there. Does anyone know how to find it or how to change it?

Here is a link to information about the iCloud.

Posted by,
cat0w (USA)