Hold the treat close to your palm that's on the ground, so that your palm is in between the treat and the chicken. Keep holding the treat close to your palm on the ground so the chicken has to walk onto your palm to get it. Don't give the chicken the treat just yet. Make sure both of its feet are on your palm before you bridge and give it the treat. Don't lift your palm off the ground yet. Let the chicken get comfortable stepping on your hand a few times first. Wait for the chicken to step onto your palm before you lift it. Don't lift your hand too high at first or you may startle the chicken. Keep your hand steady in the air. Don't rush the process. Take it slow so the chicken gets used to standing on your hand. After a few sessions, try moving your palm back and forth slowly while the chicken is on it. Eventually, you should be able to walk around with the chicken perched on your hand. When you're ready for the chicken to get off your hand, gently place your hand on the ground so it can step off.

Summary:
Put your palm face up on the ground and hold a treat in your free hand. Show the chicken the treat and wait for it to walk over. Make your bridge noise and give the chicken the treat once it's on your palm. Try again, this time lifting your palm a few inches off the ground. Repeat daily, lifting your palm a few inches higher each session.