yes the manual is old and very generic!
There are no 2 leds showing the function status and battery level, there are only 2 led showing the function of the HugyCheck system
This two leds are (on the D7000 and D800 housing) now on left, lower side of the camera mounting plate attached with an velcro pad and they are basically 2 LED lamps with a velcro around it.
and they are showing the HugyCheck vacuum level.
The small pin holding the camera aligned with the camera mounting plate have to fit the small hole on the camera body.
If you hold the mounting plate the right way and it still not fit the hole, it may be:
a) the wrong camera mounting plate, for a different camera (most likely a mistake while packing the camera)
b) the hole is drilled in the wrong location
Please contact HugyFot in Belgium regarding your problems, Pascal is alwasy very helpful to support you!