Cut the grapefruit in half, put it in the juicer, and start juicing.

Using a grapefruit juicer is very easy. First, cut the grapefruit in half. Then, press the button on the juicer and place the grapefruit half into the juicing slot of the juicer. Next, secure the lid of the juicer to ensure safe use. Finally, press the start button on the juicer and the juicer will start working to squeeze the grapefruit into juice. After the juice is finished, pour the juice into a cup and enjoy.