Actually you can see how it attaches on this webpage here
https://www.thunderheadoutfitters.com/product/molle-molded-waist-belt-acu-digital
But basically it has 4 straps that go through 4 cinch ladder lock things - they form loops that go round the frame
On the lk35 the straps align with the triangular bits that the shoulder strap bottom straps attach to.
The other 2 straps on the belt just go round the frame
https://www.thunderheadoutfitters.com/product/molle-molded-waist-belt-acu-digital
But basically it has 4 straps that go through 4 cinch ladder lock things - they form loops that go round the frame
On the lk35 the straps align with the triangular bits that the shoulder strap bottom straps attach to.
The other 2 straps on the belt just go round the frame