The Kit does require a little light soldering. In theory you could use all the parts and build them onto a breadboard, but the coin holder is a little difficult since its not breadboard-friendly, so please go ahead and build the kit.
When building the kit, leave out the 2.2KΩ resistors - by leaving them out, we force the RTC to communicate at 3.3V instead of 5V, which is better for the Pi!
- Connect VCC on the breakout board to the 5.0V pin of the Pi
- Connect GND on the breakout board to the GND pin of the Pi
- Connect SDA on the breakout board to the SDA0 pin of the Pi
- Connect SCL on the breakout board to the SCL0 pin of the Pi
DONT FORGET TO POWER IT FROM 5V - THIS IS FINE AND SAFE FOR THE PI - JUST MAKE SURE TO REMOVE THE 2.2K PULLUPS AS MENTIONED IN THE LARGE RED BOX UP ABOVE TO KEEP THE I2C PINS AT 3.3V LOGIC LEVELS
You'll also need to set up i2c on your Pi, to do so, check out our tutorial on Raspberry Pi i2c setup and testing at http://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/configuring-i2c