If you’re coming from Leeds end, you can turn left over the canal where the sewage works is, before you start the road climb there’s a fence with a bridle path almost immediately on the right. That bridle path takes you along the opposite side of the canal before winding it’s way up to the jump park.
If you come from Shipley end, the easiest way of getting to it is over the bridge and up the cobbled bridle path (about 1 mile from the sewage works). This takes you to a quiet road, which if you continue up and go left at the top, it takes you to the jump park and the other bridle path. Have a look on Google maps, it should be fairly obvious. There’s other routes in there too but they require a bit more exploration to find the best ones.