conversion - Converting RGB to CMYK color profile in GIMP

I want to convert an sRGB image in gimp to CMYK.

Heres what I did:

1. 
   

   Downloaded CMYK color profiles from Adobe.

   
   


2. 
   

   Extracted them in the icc folder (/usr/share/color/icc/)

   
   


3. 
   

   I opened my xcf image in gimp and went to Image -> Seperate -> Seperate

   
   


4. 
   

   I selected the folder (icc folder) where the color profiles were and clicked the convert button.

   
   

It shows me a new duplicate of the image except that its changed the color to grayscale and the image to .tif!

The other thing I did was:

1. 
   

   Went to Image -> Mode -> Convert To color profile...

   
   


2. 
   

   It asked me to select to what workspace I needed to convert and I went into the folder (/usr/share/color/icc/) and selected a CMYK color profile.

   
   


3. 
   

   After clicking Convert it gives me the error: "Destination profile is not for RGB color space"

   
   

Now how do I really convert my image which is an ad by the way so I can give it to the newspaper?

PS: I need some quick and great response on this within 2 hours! So please help!

Bravo.I