A basketball spinning on someone is a fun trick that can be performed with good coordination and balance. Here's a step-by-step guide on how to do it:

1. Start by standing with your feet shoulder-width apart.
2. Place the basketball on the ground in front of you.
3. Bend down and grab the basketball with both hands, fingers spread wide for a better grip.
4. Lift the basketball off the ground, using your legs and core muscles to generate upward force.
5. As you lift the basketball, give it a slight spin with your hands, using your fingers to create a backspin effect.
6. Once the basketball is spinning on your fingertips, quickly extend your arms upward, bringing the basketball above your head.
7. As you extend your arms, keep your fingers underneath the basketball to maintain the spin.
8. Maintain a steady pace and balance as the basketball continues to spin on your fingertips.
9. To add a bit of flair, you can try spinning around or walking while keeping the basketball spinning on your fingertips.
10. When you're ready to stop, slowly bring the basketball back down towards your body and gently catch it with both hands.

Remember, practicing this trick may take time and patience. Start with a slow spin and gradually increase the speed as you become more comfortable. Also, make sure to perform this trick in a safe and open space to avoid any accidents.