You need a training treat and a clicker.
I found Henry's training treat by putting five different foods on a plate and watch which one Henry ate first I used sunflower seeds, corn kernels, pine nuts, grapes and balls of millet. This would become Henry's training treat and I removed this food item from Henry diet. Whatever your bird picks, it must not be part of the bird’s diet otherwise it defeats the purpose of being a training treat. Henry picked sunflower seeds.
Next I use a clicker to identify the desired behaviour, plus training treats and praise to reinforce that desired behaviour. It's no secret, you just need to spend time interacting and training with your bird.
The clicker is the bridge between you and your bird and you use that bridge to highlight the bird’s desired behaviour to your bird.
I put Henry on his play gym and gave him a sunflower seed and click the clicker. This indicates that training has started.
Then in my right hand I held the clicker and the sunflower seed. The set up was the clicker in the palm with my middle finger on the button and the sunflower seed held between my thumb and index finger.
With my left hand I made a pistol so my finger was parallel to the perch and about 3 cm away. Then I would bring my right hand up behind my left hand and show Henry the sunflower seed and say "step up Henry". if after 15 to 20 seconds Henry hadn't stepped up onto my left hand I would remove the sunflower seed from his sight. but leave my left hand there.
Wait 20 seconds and reshow the treat. (this might take more than one go.) When Henry stepped up onto my left hand and took the sunflower seed I would click the clicker at the same time. Then I return Henry back to the play gym Tell him to step down, reward with a sunflower seed and click the clicker at the same time, then repeat the cycle. Henry now steps up and down without training treats and this was achieved in less then a week.
The advice I can give is
1 move slowly around the bird
2 let the bird come to you.
3 Don't force the bird to do anything that it doesn't want to do.
4 make the trust building and bonding sessions (training) fun
5 end all training sessions on a positive.
6 patience.
Remember food is a great motivator.
Stay away from the parrot wizard.