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That is because you will be creating a space for the array to fill. Once you have it there, type in the number of total copies you want. In this instance, 4/ to create a total of 5 doghouses. 4/ and then Enter If it doesn't look right and you haven't done anything else, you can type in another number and it will change. In the screenshot at the beginning of the article, 3/ and Enter was pressed to get all of the doghouses.
Have some idea of the number you will need. Select the entity, start to move, press CTRL and move a distance away. If you want to make a 'field' of your entities, select them and do it again.