Pass chaingable string from void loop to another function - arduino-ide

Question

I am making an app using MIT app inventor that sends data to ESP8266 ..I want to send the password and store it EEPROM .. it is a changable string.. every thing looks fine when I use RecieveData function ... but the changes must happen in void loop ..
how can i pass this SecondValue from void loop instead of RecieveData function
#include <ESP_EEPROM.h>
String PW ;
String SecondValue;
void setup() {
Serial.begin(115200);
Serial.println();
SecondValue ="0";
PW = "2" ;
EEPROM.begin(sizeof(512));
WritePassWordToEEPROM( 0 , PW );
boolean ok1 = EEPROM.commitReset();
Serial.println((ok1) ? "Commit (Reset) OK" : "Commit failed");
Serial.println("read");
Serial.println(EEPROM.read(0));
PutValueInMemory() ;
Serial.println("the stored value is that read :");
Serial.println(readStringFromEEPROM(0));
}
void loop()
{
// Iwant the string to be passed from here
//SecondValue ="MMMMMMMMMMM";
}
void RecieveData()
{
SecondValue = "MMMMMMMMMMMM" ;
}
void PutValueInMemory()
{
RecieveData() ;
if ( SecondValue != PW )
{
PW = SecondValue ;
}
WritePassWordToEEPROM(0, PW);
EEPROM.commitReset();
}
//save the password to eeprom .. function :
void WritePassWordToEEPROM( int address , String str){
byte len = str.length() ;
EEPROM.write( address , len ) ;
for ( int m = 0 ; m < len ; m++ )
{
EEPROM.write( address + 1 + m , str[m] ) ;
}
}
//Read from EEPROM
String readStringFromEEPROM(int address)
{
int len =EEPROM.read(address);
char data[len + 1];
for(int i =0 ; i < len ; i++ ){
data[i] =EEPROM.read(address + 1 + i ) ;
}
data[len] = '\0' ;
return String(data);
}