To modify the Shot price of an ingredient, select Menu Setup from the top bar of the home screen.
Go to Mixed Drinks, then Mixed Drink Ingredients, and choose Add/Edit Mixed Drink ingredients.
In the Search field, start typing in name of the ingredient you need to modify.
Under the Shot Price column, click twice on the ingredient you need to modify to open a text edit field; enter the new price. Hit Enter to save, then click Close.