Check you LCD if its a 16×4 then just add 16 to 0x80 address which the address of 1st line in 16×4 LCD and same is for 20×4 LCD add 20 to the address 0x80 the value u get after addition will be the address of 3rd line and the same is for 4th line add 20 to the address 0xC0.
