Some practical uses for the Cho Ku Rei symbol, once you’ve been attuned to it are that it will naturally amplify any energy it is used with. Also, when applied for healing purposes, it will accelerate physical healing and rejuvenation.
Below are just a few examples of how to use this powerful symbol of the Life Force:
To use this symbol in a standard Reiki Treatment for yourself or someone else, just evoke the symbol by either drawing, visualizing, chanting its name, or even all three. You will need to chant the name three times, according to Tradition. If your doing a full Reiki session, then simply use the hand positions as implied in the attunement. However, unless you are working on yourself and have this as a preference, only place your hands on either side of the chakras, not actually on them if physical contact is used. For quick reference, the Traditional Hand Positions used for treatments can be found here: http://www.reiki.nu/treatment/hand_positions/hand_positions.html
Another thing you can do is use Reiki to empower your magick. Any spell or shield you wish to strengthen with the Reiki energy can be amplified using this symbol. For instance, if you are making a psychic shield, evoke this symbol with the intention to be protected from harm. I've seen people punch holes in clouds by evoking this symbol as well. The applications are really only as limited as your own mind. Feel free to experiment with it. Your Reiki knowledge should become a natural part of you, so that using it is as natural as breathing.