Electric hand planer help?

Kelsey

So i read the instructions, gave it a try but it keeps missing big patches of wood, and the parts that do get planed (more like barely shaved) have visible barrel marks from the blades. I haven't been moving it fast at all, but maybe my slow is still too fast? Or too slow? Do i need to adjust the blades to get a better plane? Help!! 100% new to woodworking but trying to plane a slab of oak from an old bridge to make a table top