Select the text you want to format
Open the paragraph or formatting settings
Find the indentation options
Set the first line indent to none or zero
Set the left indent to the desired amount
Apply the changes
In Microsoft Word, use the ruler or Paragraph dialog box
In Google Docs, use Format, Align & indent, Indentation options
In Pages, use the ruler or paragraph settings
In LibreOffice, use the Paragraph dialog box under Indents & Spacing
Verify that the first line stays at the margin and the remaining lines are indented