In AMPscript, to create a FOR loop that populates HTML table rows, the developer should place the FOR keyword before the <tr> tag. This ensures that each iteration of the loop creates a new table row with the appropriate data.

Example:

<title> %%[ FOR @i = 1 TO RowCount(@TargetDE) DO ]%% %%=Field(Row(@TargetDE, @i), "FieldName")=%% %%[ NEXT @i ]%% </title>