Are you looking to have a quantity rather than an amount as a goal?
To do this, start by editing your Event Page and go to the Event Settings step. Scroll down until you see Page Content & Display Options.
Turn your Display Goal toggle on. Then, type in your Goal Quantity and make sure the drop-down menu says "Goal Quantity," as well (see the image below.) Under Goal Chart Title, you can choose to give your goal chart a name.