If this is fresh burn then cool it with running water.
You need a temporary dressing over fingers yo avoid infection.
Actively you need to use your hand to avoid stiffness in future.
This will heal within 2 weeks.
Next Steps
find a plastic surgeon/burn surgeon near you and visit for dressing
Health Tips
dont apply homemade ointments. dont apply toothpaste or Choona ( people tend to advise these)