Hi Percy,
Your simplest method might be this one:
Click on any cell in the row below which you want to insert a new row.
Press option-down arrow.
If you want to add more than one row:
Click on any cell in the row below which you want to insert the new rows.
To insert 'n' rows, command-click in the cell that is n-1 rows above the row you first clicked. This expands the selection to the number of rows you want to add.
Press option-down arrow to add the new rows below the first selected row.
Inserting a row or multiple rows above a selected row (or group of rows) follows much the same proceedure, As does adding one or more inserted columns to the left of right of a selected column or columns.
In all cases, the number of rows will match the number of selected rows or columns, the position of the inserted column(s) will be controlled by the direction of the arrow key used, and the first row or column will be adjacent to the selected row or column that is located furthest in the direction of the arrow key used.
Regards,
Barry