need some help with burning neogeopocott

I am having difficulty burning neogeopocott for DC. I have read a thread that teaches or shows how to burn it with selfboot. However, it is said in the FAQ that in order to burn it, we need a ip.bin, 1st_read bin and one image. I just don't get the image, so would you guys tell me where to find the image please.

P.S I have tried to burn it without the image, it just turned blackout when I put it in the DC, but before it did, the Sega Dreamcast white screen appeared.