Lily Pad Shirt beginner questions

Hello guys,

first of all: I am completely new to Arduino and programming.

My project is a shirt that is similar to this: http://web.media.mit.edu/~leah/LilyPad/build/turn_signal_jacket.html
(except I don't want to include that day/night mode.
I have a right switch connected to petal 6(+) and 7(-) while the left switch is connected to 5(+) and the battery's - petal.
I have sewn my first 10 LEDs to petal 13 and my other 21 LEDs to 11. The - petal is 12 for all of them.

I checked the LEDs with a simple blink code without the switches.

My problem is that I don't have any idea how to programm the code with the switches.
Any advice?

http://web.media.mit.edu/~leah/LilyPad/build/turn_signal_code.txt

Actually I already found this one a while ago but I wanted to change this code without the night mode effect. (And maybe make it possible to let both parts blink at the same time)

So I wanted to know how to change that behavior.

Regards