There is not an "easy fix" when it comes to taming a pet bird, this is a time consuming process where the first goal is to earn your bird's trust in you.
The necessary work in training must be done in a consistent manner.
First of all, it's important to establish the foundations of trust and this is done by getting your pet bird used to your presence and voice.
Once they show signs of being receptive to you (by moving closer to you), you can then proceed to offer them a little tasty treat to eat in order to encourage your budgie to step onto your hand/finger.
You will find all the detailed information and tips by reading the stickies at Taming and Bonding section's main page.