bash scripting newbie

hi guys

I am new to bash shell scripting and have a few questions. I am from a java background.

Below is my customer.sh file which invokes the customer.jar
1.  I want to modify my customer.sh file so i do
$ vi customer.sh
but it does not allow me to modify(it is read only), any idea why?
How can i make it editable?

customer.sh

#!/bin/bash

export JAVA_HOME=/javaProj/jdk/1.6.0_22   
export PATH=$JAVA_HOME/bin:$PATH:$LD_LIBRARY_PATH   #  I am not sure what is $PATH:$LD_LIBRARY_PATH , any idea
export CLASSPATH=$CLASSPATH:$ROOT     #  I am not sure what is $CLASSPATH, any idea
export ROOT=/project/customer/customerAutomated

 touch $ROOT/customer.log   # does touch means it creates a file?
chmod 0777 $ROOT/customer.log

logAutos=$ROOT/autosys.log

emailFailFile=$ROOT/emailfail.txt

emailSubject="ERROR:- customer Status on `date`"

sendtotargetName="jacks@humpingtree.com"

echo " " ; echo "BEGIN TIME = `date`"

cd $ROOT

java -Dicg.env=prod  -jar $ROOT/customer.jar 123    # any idea what this means 'java -Dicg.env=prod'
sleep 2      # this makes the program sleep for 2 seconds, right ?

#***************************************************************************
echo "Checking Logs..."
#***************************************************************************
if ( grep "Problem occurred" $logAutos );
then
        echo "Alert: Problem occurred while updating customertables..."        
        echo "END TIME = `date`"
        exit 1
fi

echo "END TIME = `date`"
exit 0

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Any help will be greatly appreciated
thanks