LCD experiment involves lot of connections. Please make sure you have connected all the required pins to arduino and LCD module. Also, as described in the tutorial, you need to add the liquidcrystal library in your code.

sir done already 

Please make sure both the functions, i.e. void setup() and void loop() are present in the code. Even if you are typing the Hello World inside void setup function, you need to keep void loop() function in the code

Were you able to perform the previous code i.e. First Row & Second Row successfully ?