Unless you just have a couple chicks, that brooder is much too small. You can probably salvage it by adding another bin of the same size and connecting them end-to-end with a doorway, putting the food/water in the bin without the heat lamp. Chicks need a temperature gradient of at least 20 degrees to be able to regulate their own comfort...a heat lamp in that small of a bin will just turn it into an oven. By adding a second bin, you may be able to create the gradient but be sure to check before adding chicks. The second bin may require additional ventilation to accomplish it--depends on the ambient temps. If you adopt a different warming technique like "Mama Heating Pad"--search for the thread--you can achieve a temp gradient in a smaller container (depending on ambient temps), however you really do want at least 1 square foot of brooder space per chick to help prevent problem behaviors (such as pecking/cannibalism). As is, once you get a feeder/waterer in there, you will only have room for a few chicks.
Usually you want an "open" top (a mesh cover is desirable to keep the flyers contained) on a brooder so you can adjust the temp by being able to raise/lower the heat lamp. You can have a similar effect by switching out bulbs of different wattages, but that only allows a coarse adjustment...no fine tuning. Again, not an issue with MHP.
Having the door on the side instead of the top is a boon for taming chicks. Being able to reach in from the side to change food/water, handle chicks, offer treats instead of coming from above like a predator won't trigger their panic response as often.