please visit the link, here you will get how to take analog input https://www.engineersgarage.com/embedded/arduino/how-use-analog-input-and-analog-output-arduino-board
Now, you can get analog input from load cell after this jus put 1KG load to calibreate it for example if you getting 376 analog value at 1KG just divide the analog value with 376 to get exact value of load.