The One Point is essentially the core of our being. It is beyond the meridian system and beyond chakras and any other system. It is the interdimensional portal through which we can connect with the centre of centres, within every other form.
To find the One Point inside your own being, follow your intuition deep into your belly. When you come to a point that feels to be the exact centre of your being, then you are in the One Point. Note: this may differ slightly from person to person.