Editing a Block With Attributes

I was excited to learn how to revise blocks within a drawing, and have used it frequently. I cannot, however, figure out how to edit a block that has attributes.  I don't want to edit the attributes, themselves, but the physical parts. (For example, it was created on the wrong layer and I want to correct that.)  I can't find anything in HELP that explains this.  Can someone please help?

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