You want to put the front strut together. Set the top where it needs to go - tighten it up, and back off the bottom so the spring is loose.
After the top is assembled and tight, snug up the bottom spring location by hand.
Measure the spring from top perch to bottom.
Use the spanner wrenches supplied with the kit to snug up the rings at the bottom to compress the spring and provide the recommended preload on the spring.
The lower locking ring is to adjust ride height.
I used a picture of a supercar, but the XA's are adjusted the same way.
This picture may help.
2010 2SS/RS RJT 6SP
600 HP Lingenfelter package 526 RWHP 491 RWTRQ
Pedders Justice package with Z-bar and supercar coilovers
LPE ZR-1 twin disc Clutch, LPE rear w/3.73 gears
NHRA cert. 8.50 CM 10 point roll cage, Cobra racing Seats
Gforce 5 PT. Harnesses, MOMO steering wheel and pedals
285/35/19 Bridgestone RE-11 Tires, CCW 19X10 SP16A Wheels
315/30/18 Front, 335/30/18 Rear Hoosier tires, CCW C2K Wheels
Racing Brake Rotors, stainless lines, MT800 Brake pads
HD Rear Axles, Toe Links, Trailing Arms, Lower Control Arms
Beware of the LPE Brotherhood