Move iTunes to new computer?

I have read TONS on moving itunes to a new computer, and yet I can't get it to work.

The issue is that where my music WAS on my old computer was an external drive. I want to move it to the INTERNAL drive of my new fusion drive mac ... Please help???!

any idea why that consolidate won't work though? I'm getting the error: "Copying files failed, because you don't have permission to change your itunes media folder or a folder within it."

i have triple checked my permissions on that folder ...

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IOW (I wasn't clear), I can't follow the support article because that last step won't work for me (the consolidate)

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My folder of music shows under "sharing and permissions" "CUSTOM access" instead of showing MY username ... So that's an issue ,...

But what about moving it to aNOTHER COMPUTER?!