Start by preparing the produce: wash the apples, beets, celery, and ginger, then pat them dry using a kitchen towel. No need to peel any of the produce, but I personally like to cut off the ends of the beets and celery. Depending on the kind of juicer you're using, you might need to cut the produce into smaller pieces.
Next, add the produce to your juicer's hopper (if your juicer doesn't have a hopper, start by turning the juicer on, then adding each piece one by one).
Turn your juicer on and watch the magic happen! Tip: if any of the produce pieces get stuck, simply use your juicer's reverse setting. This should solve it instantly. Optionally, you can strain your juice using a strainer (this simply depends on your personal preference).
If you're enjoying your beetroot juice right away, pour it into glasses over some ice cubes. If you're planning on drinking it later (I recommend not waiting more than 2-3 days), transfer it to glass bottles with airtight lids and store them in the fridge.