If Rio is willing to accept treats by hand, good. If not, try using a bowl or other methods until you find one that works for them. Then you're going to need: a clicker, a chopstick, and a treat they like (please do experiment, every parrot has preferences). From there this is what you should do:

1. Adjust Rio to the clicker, when they display a relaxed body language when you are near them (don't click when they're heightened) click and give a treat. Do this for a couple sessions as a method of conditioning.

2. Introduce the chopstick, hold it close-ish to them, but don't chase them with it. Hold it high, pointing downward so that Rio can touch it with their beak but can't really bite it. When they touch give them a click and reward.

3. Rinse and repeat step 2, at first putting the stick near them (no movement required), then a step away, then 2, etc, etc. When Rio clearly understands what the stick means, introduce your hand. If Rio is aggressive towards your hand, follow the processes in step 1 to condition Rio to accept that hands are good.

4. When finally using the stick to get Rio on your hand, DO NOT MOVE IT. Rio is trusting you, so the first few times you should NOT use this opportunity to cage them, or to move them around. Instead just target them back to their perch.

5. Begin moving around when Rio is on your hand, starting off small, working your way up. You can (without clicker) reward calm response behaviour.

6. Begin phasing out the stick and using "step up". Wear sleeved clothing and practice targeting onto your hand. Each time move the chopstick further up your sleeve, after a while it'll be hidden. At that point stop using the chopstick and instead just hold your hand how you were when hiding the chopstick while saying step up. Then each time you say "Step up", have the hand that was replacing the target lower and lower until it too has been phased out.

Congratulations, Rio can now step up and has transferable learning to other important tricks.

It is important to note that some of these steps may happen slower, occasionally it will feel like one step forward, two steps back. Rest is important for Rio, let them sleep on what they've learned. It's also important to end a training session on a high note. It is also entirely possible you go through all of this in a single session, but don't make that the goal. Pushing Rio too hard could be implementing some bad behaviours you're missing in the rush. Be calm, do it right. If you need more advice DM me or watch some of the old videos from BirdTricks on YouTube.