How could I gain muscles?

Anonymous
Hi, im a girl in my early 20s. Very small and do Yoga. I am as small as a Kpop idol, she has my type of body.
How could I gain muscles?
I have been working out for a long time, but i don't gain any muscles and my belly still slighty sticks out despite being thin. What should I do? What should I eat? I'm also a bit underweight.
How could I gain muscles?
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