Think of each number as a ticket placed into a bag. When you draw a number, one ticket is selected at random.
There are two options to enter tickets for drawing:
Once the tickets are enter using either method. You can view the tickets in the bag by click on "View All Tickets." There is an option to "Hide Tickets" if you wish to not see them. Below the "Hide Tickets" button, it will say the number of tickets in the bag. And in the bag are the following tickets. If you are generating them, it will be a list of numbers. However, if you entered them manually, depending on what you entered, name or numbers will be listed below. The number of tickets are also available right below the image of the bags with tickets inside it.
When ready, click on the green button "Draw Winner!" to draw a ticket. The tickets will be picked at random. The bag of tickets will shake for a bit, and then a ticket entry will show up under the "The winning ticket is..." within an image of a ticket.
The winning ticket entry will be listed under "Tickets Drawn". If the "Draw Winner!" is clicked multiple times, picking multiple winners, they will be listed in order of when they were picked.