I just bought a Twin Industries TW-E41-102B, and I'm new to physical logic gate stuff, how do I power the breadboard? Please help!
Here is one way, using a wall-wart or similar wall plug power supply or battery pack, courtesy of a Sparkfun tutorial:
If you get more involved you may wish to use a bench power supply that has banana jacks on it, in which case they will plug into the top of the colored binding posts, and only single wires will come from the binding posts to the breadboard. In the photo above, they're being used simply as tie points (so if you yank the cord it won't pull the wires out of the breadboard). Make sure nothing can short the binding posts on the bottom (they should be clear of the work surface by virtue of the rubber feet, but make sure nothing conductive gets under there).
The breadboard itself doesn't need powering, since it is nothing more than a collection of passive conductors. It is quite common though to connect the two sets of parallel "power rails" above and below the main area of the breadboard (red to red and blue to blue) and supplying power via them, optionally connecting them to the binding posts if power will be supplied from a banana plug.