Craft Edge

I do not understand, a file print and preview to see what the colors look like in PDF preview. Could you explain to me how to do that. This is all so new to me and I am not a techie.

When I go to import on files, then to my folder with my j peg digis, it will not let me open them.

I have downloaded jpeg images. When tracing, the colors do not come in as the jeg shows. Also I am unable to import the pictures. I am working off a Macbook. thanks in advance.