How to dye hair with coffee?

Do I have to brew it first? Should I use an actual cup of made coffee? Any ideas??

first you can put hair colour or whatever into dry coffee and then put some water in it and then leave it gor half a day or full day then put it on your hair and then when it is dry you can take a hair bath or something.

Yes, you should brew it first.

Here is an article about dyeing hair with coffee:
http://thebeautybrains.com/2008/08/25/is-coffee-good-for-coloring-hair/

I've never heard this before in my life, it's terribly fascinating though. Does it make your hair smell nice?