Rather than a finger point, I start with a bent elbow at shoulder level and then a sweep of my wrist out with a flip of my hand, using whichever arm is on the side I want him to move toward. To go forward or back, I start with bent elbow from slightly below shoulder level flipping wrist and hand out to the front for a forward direction, with an almost straight downward pointing arm and a hand flip curving out and then around to the back to get him to move behind me.
I stick a leg out a little and tap my toes to get him to look at the ground.
All of this sorta sloppy and repeated a couple of times if you’re out and about with the dog.
To help him learn, you can also try the same motions using a bit of food or a ball--the dog’s eyes will follow the treat and get the idea which way he should be moving with the signal. Then you can start just using the signal and he should get it.
Like Rosemary says, dogs can’t necessarily see a finger point from a distance, so it works better if you use your whole arm in a swinging movement (which IMO makes the dog look more in the direction you want him to go) rather than a static hand point.
For any of those to work, the dog has to be actually LOOKING at you...sometimes the hardest part when you’re out in the field
So I’m sitting here in my chair waving my arms around trying to figure out exactly what I do, and my dog is going all confused on me.