Help with Rossignol boot

My wife and I are new to snow skiing and have purchased
used ski boots.

She got pair of Rossignol R900's. They have what appears
to be 2 adjustments and I would like to learn what these adjustments
do.


1. A black "knob" on the back set to "1" with
a tab that reads "lock".

2. A metal screw head on the ankle that uses an allen
hex wrench to move the screw head in 1 of 3 positions.



She complains that she feels like she is leaning too far forward
when wearing the boots.


Any help in this matter is appreciated.


Don