I do not believe this question can be properly answered through a simple written answer. Learning this is something that requires working with a qualified teacher in my experience. However, I can tell you what I do:
I gently move the qi away from my head toward my lower dan tein.
That is probably easier said than done for most students, which is why I think this needs to be taught in a context that includes sharing your experiences interactively with a teacher so the teacher can guide you appropriately toward the goal. (Attempting to teach yourself might lead to frustration which could be counter-productive.)
This answer is related:
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In that answer, I said:
Assuming you are a more advanced practitioner and you are good at sensing and moving subtle energy, I can suggest that you establish a circuit between your eyes and your lower dan tien (a.k.a. tan t'ien or dantian).
However, if you are in downward dog or any inverted yoga posture, you would not establish an energetic circuit between your eyes and your lower dan tien. You would instead prevent energy from building up in your eyes or head, and keep it in your lower dan tien.
That's my technique. I use Serene Impulse to accomplish it.
Many thanks for this response. It actually is a good answer for me as it validates what I have already heard from other practitioners. I am working with my qigong coach to modify my practice and to learn how to lower my Qi so that it is more user friendly in my dantian.
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