The steps to use Discount Code when shopping in Holy Grail Steak Co are as follows: The first step is to log in to the account of holygrailsteak.com. The second step is to add the selected Holy Grail Steak Co products to the shopping cart. The third step is to click on Holy Grail Steak Co payment page and select the corresponding available Holy Grail Steak Co Promo Code, and then choose to pay.