How to iterate row and column of an excel

Hi Experts
Let me know how to iterate rows and column of an excelsheet. I can read the first row but need to iterate through each subsequent rows.Also make while reading from excel into a particular data sheet on web wants to make sure the date and time stamp and other values do not change.

It is still writing to the 1st row and not going to the subsequent row.I can share my robot.Do let me know.Thanks