alright well i can help you out unlike most people on ns
heres what you need to do
1. find two shovels, one for digging and one for shaping
2. go to where jump is and start piling tons of snow into large pile
3. make pile of snow to be about six feet wide and 4 feet high, if you have the snow that is
4. start shaping jump to how you usually see jumps shaped as, it should have enough slope and kick so that it will launch you, make it to be like semi flat take off and not pointed up
5. with the shaping shovel start shaping jump and fixing the sides of the walls and back of take off and make sure you pack it tight so that it doesnt fall apart, spread salt on it to make it melt a little and then it will freeze leaving a solid structure
6. i wouldnt hit the jump right after you have built it but hit it maybe an hour later or day later depending on how cold it is, if its good packing snow then it should be ok but if its light sort of powder it wont hold
7. search the forums to see what a jump looks like and how the take off is concerned as, the only thing that you need to worry about is your take off.
8. hit it and make corrections if neccesary