Actually... all you need to connect to the Arduino is the switch... but... see the "but" in a minute...
I'm not good with the graphics, but it is so simple you can do it with text...
Wire from ground.
To Arduino input/output pin, e.g. Pin2
You can do that over and over, lots of wires to ground, lots of switches, one wire from "other" side of each switch to a different input pin.
But! What about the resistor?!
There's one in the Arduino which can be "connected" (correctly!) by a little bit of code. Such resistors, be they discrete resistor outside the Arduino (as discussed in previous posts) or inside the Arduino are called "pull up" resistors.
Software, and a more lucid (I hope) explanation of all this is at...http://sheepdogguides.com/arduino/aht0button.htm