Student or Learner
Could you please tell me how to do it?
Would you tell me how to do it?
Both are correct. But your question should read "Is this right?" The reason is that we don't use 'it' in such a bare sentence unless 'it' refers to something already mentioned (or which is about to be mentioned): "Is it right that in Indian cookery we add salt to the onions as soon as we begin to fry them?"
Or, better yet, since you have two questions, it should read: "Are these right?"