The most common mistake with using this kit is getting the jumper backwards, and thus trying to run DK on a JR board, or vice versa. If your you screen looks anything like the screen shots below, then you have the jumper backwards. Pay careful attention to the title on the powerup diagnostic screen. It will tell you what mode the daughter card is running in.
The other common mistake is not having the daughter card inserted correctly, either hanging over the socket by one pin, or in backwards. In this case you will usually just see the powerup garbage on the screen. This garbage is just the random bits that are in the character RAM at powerup, and it indicates the CPU was not able to run.