Help > Authoring > Working with Tables > Table Editing > Modifying Table Attributes
  
Modifying Table Attributes
1. Select the cell, row, column, grid, or table.
2. Choose Table > Modify Attributes.
3. From the submenu choose one of: Cell, Row, Column, Grid, or Table. Column and Grid are not applicable to custom tables.
4. In the Modify Attributes dialog, edit the changes and press OK.