When you start CSVEditor, an untitled new spreadsheet window opens.
It shows one row with four columns, plus a toolbar with several function icons. The toolbar icons describe themselves.
When you add a row or column, it is always added at the very end
of the current spreadsheet. If you want to e.g. insert one or more
rows somewhere else, select a row and choose from the Rows menu
Insert Rows
. You can then define how many rows to insert, and
where to insert them.