Multiple I2C Devices connected parallel
Connect one at a time and run the change address sketch mentioned by Yeti.

Naturally change each one (one at a time) to different addresses (ex. 0x62, 0x64, 0x66).


  i still don't know whats the address of the 2nd one 


The address is what you change it to.

Then connect them all back up again and run the I2C scanner. You should see all 3 addresses.




  documents state that address changes will be gone when i power it off


If that is true, save the address for each module in EEPROM. Then use that code to change the module address in setup.



See the address in the code you posted?

#define    LIDARLite_ADDRESS   0x62          // Default I2C Address of LIDAR-Lite.


If you don't want to save the address in EEPROM just upload three versions of the sketch with a different address in each one. Note that the address must be even (eg. 0x62, 0x64, 0x66).

But it would be very simple just to read from EEPROM in setup and keep the address in a variable rather than a #define.