This point is three of the women's finger widths above the transverse crease of the inner wrist. It lies directly between the two tendons felt here. (The tendons of palmaris longus and flexor carpi radialis).
This can be used for mild feelings of nausea through to vomiting.
Place pressure on the point and hold until the symptoms are relieved, usually within five minutes. You can use pressure on both wrists or only one, whatever is more practical at the time.
It is possible to buy a wristband to help apply pressure to this point. They are available through chemists and have plastic buttons on them to place pressure over the acupressure point.
Alternately you can make your own. Form a wrist band with elastic, and sew onto it a rounded button. Wear it with the rounded edge pressing into your skin. Take care that once in place the pressure exerted on the acupressure point through the button is firm but not uncomfortable.