Cannot install Yosemite as hard drive is used for Time Machine Backup, How Do I Change This?

I have a 2010 MacBook Pro and when I attempted to install Yosemite the MacBook Pro Drive is greyed out and a message appears that read,"drive is used for Time Machine Backup." How do I change this to install Yosemite?
Thanks,
Scott

Well, if you don't want to use that drive for Time Machine anymore, then you should format it using Disk Utility. Then you can install Yosemite on it.
You should, of course, have another full backup somewhere. I really can't state this strongly enough: You should have a full and complete and up to date backup of all your data before you upgrade to OS X Yosemite.

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