Easiest is to follow the fire road that runs pretty much parallel to the beast of burden. You can’t miss it.
You can ride up the uplift road and some people do, but you’re exchanging a slightly flatter climb for more distance, seems a bit pointless with an e-bike.
1 tip is that it’s only about a 15 min ride from where Beast crosses the uplift road to where Terry’s, Hot Stepper and 50 Shades go into the woods (again, can’t miss it). The best ‘bang for buck’ if you’re pedalling up is to session these sections. You can ride all the way to the bottom but it’s a bit of a slog back to the crossing or you could pedal all the way to the top, but for those trails all you’re doing it riding for another 15 mins or so on fire road, to come back the same way on fairly featureless trails, not to say they’re not fun, but they’re not really worth the extra pedal.
Times are based on normal bikes, not e-bikes and probably a slightly rose tinted memory. With an e-bike you might as well ride to the top, it opens up a lot more of the park to you.