Hello and welcome from myself and my two birds! Rio looks lovely!
As the members have said this is a trust building game with your new bird, you have not had him very long and he will still be getting used to you. Plenty of positive reinforcement when he does something good, and if he bites try not to tell him off. If either of my birds bite i leave them, walk away and come back when they are doing something good. I don't shout or tell them off, may say 'no' then walk away but you don't want to pair yourself with a bad experience with him.
It does take time, and sometimes can take longer than others. Looking forward to seeing your progress with Rio!