Assembly layers and colors

I have viewed the video in which a robot is imported and then disassembled into separate components.  But I am CREATING an assemby from a bunch of components I previously designed.   As soon as I use "insert component", to place a new part it's layer becomes "0", and is LOCKED.  I cannot change layer or the component's color.    The original layer the component was on gets imported into the layers list of the assembly drawing, but "greyed out".  I'd LIKE to be able to return the components to the layer they were on when designed, and also, to change their colors.   But everything seems locked. 

How do I deal with this?

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