To start from the fifth row you just need to navigate your starting cell to be the fifth row, this is quite easy, use the command - Go to Cell under Excel commands
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If you want to start from 5th row and 'A' column then before starting the excel loop:
These are the steps to do it :
Open spreadsheet
Select Go to Cell Command under excel commands
Select Specific Cell radio button
Provide the value of the Specific Cell as'A5'(which denotes 5th row and 'A' column)