I have spent many, many hours when I worked construction in CA. on a tractor with a "box scraper" (Gannon) as I was the only one on the crew who had ever touched a tractor (I'm from Nebraska) so I HAD to catch on to how to actually operate one, not just drag it behind me. The Gannon box is a box scraper that moves hydraulically up, down, side to side and the rippers are also hydraulic too. They are a WONDERFUL tool that you can do many, many more things than most people can ever imagine, after a few years I could cut blue tops with it and my finish grading was second to none BUT there are some basic things you HAVE to know to make a box scraper work for you.
I have a Kubota
B3000 of my own and it has a Woods box scraper on it and it is a basic unit with no hydraulics. The settings on box blades are a little unusal until you "catch on" to how it actually works.
1:Take you tractor and park it on level concrete surface if possible, make sure you box blade is level when it is about an inch off the ground, if it's not get it leveled up any way you can and it will work much better for you when trying to work your ground.
2: Let the box blade completely on the ground, notice if the front blade is off the ground or the back blade is off the ground. If the back blade is off the ground the box blade is in a "digging" position and no matter what you do it will want to dig, this is fine if you are trying to trim down some ground but you don't want to try to take too much at one time, you will have to do this in several passes, the more passes the more it will go down. If the ground is loose when the box fills just take enough weight off to keep it from dropping while you are dragging the dirt, just have the back blade about 3/4 inch to start with as this is not too agressive but you should be abel to tell if you need to back it off with the middle arm or add a little more angle as long as the front bottom sides are not dragging in the dirt.
3: If you have dirt you are wanting to "feather out" or "spread out" dirt adjust so the front blade is off the ground lifted by the back blade being down further, I would start out about 1/2" up as most box blades are pretty small and will spread out rather quickly.
4: If you are just wanting to move dirt have both the front and back blades hitting the ground evenly and when you get where you want the dirt you are dragging just slowly lift the box up with the 3 point.
5: You can also let more out one side or dig more on one side by adjusting your adjustable arm if you have one. If not you can always let a little air out of one tire and put a little more in the other. Notice I said a little, not the best option but if it's all you got and you HAVE to do it then it will work.
It's simply realizing the front blade of the box is for digging and the back blade is for holding the front blade off the ground for spreading. This is for moving dirt while going forwards.
6: Cutting with the back blade is the same principle but much, much more difficult even with a fully hydraulic Gannon box but you will have traction like nothing else with all the down pressure on the back tires. It takes a ton of practice and a LOT of things can make each situation different but that is the basics of the box blade.