When you see a table grid, it will normally appear blank (no rows). To add a row, click on the "+ Add" or "+ Add New" icon/text on the top left of the grid
Click on the pencil icon to edit an existing row
Click on the minus sign icon to delete an existing row
Click on a header to sort by that column. Click again to sort in reverse by that column
Click-hold/drag to resize a column from one of the column's edges