Hi Andree Li,
reading the text I don't really understand it either.
Maybe the example in the help file F1 is more useful as you can copy it. Just search for SQLGRIDHEADERTEMPLATE
The most important information is that you can reference a data table in a html template using
{SQLGRIDROWTEMPLATE:_ID_}
{/SQLGRIDROWTEMPLATE:_ID_}
The content between the above tags will be repeated for each row which is returned bei the data table.
You can reference a column referencing it's name inside {}.
If you create the html template, make sure that _ID_ is not the fixed value of the item list from the current environment. Use the value from the Objects tab in the Expression editor. This will make sure that the correct id used, once the application has been transported to another environment.
Best regards,
Daniel