Basic question, help

How do I add a skin to a model? Propably in the editor?

u can find the path of a skin by going to the object editor, then to art - model and then go to the unit u want. there u can c the path of the unit and so u fill in that path at the imported file (eexcept mdl must be blp)

I tried to get that DarkLordMage skin in my editor working, but I couldn't. First I imported the skin and checked the right path for the bloodelf hero (something like this: units/human/bloodelfhero/bloodelfhero)
and changed the filename of the imported filepath to it and added .blp, saved and started the editor again, but nothing happened, except when I checked the proper filename of the impotred file it had changed to that normal bloodelf hero.

Why can't I get the skin to the model?
What's the filepath?

Please help, I tried to check the tutorial forum for help, but the topic seems just too big.