The 6's are just for the AIKey part.
Also, I figured out how to add digits:
1. Click on the number where you want to add digits (in this case the 4 in red)
2. Press the insert key on your keyboard
3. Type how many space you want to add into the box (2 in this case) and click Ok
This will add 2 spaces in front of the number you clicked, then you have the space to put in the 999.
It takes a long time to process it all though :(
Also, I figured out how to add digits:
1. Click on the number where you want to add digits (in this case the 4 in red)
2. Press the insert key on your keyboard
3. Type how many space you want to add into the box (2 in this case) and click Ok
This will add 2 spaces in front of the number you clicked, then you have the space to put in the 999.
It takes a long time to process it all though :(