The symbols you use to fill the cells of a communication grid are selected from a number of symbol sets. You can supplement these symbol sets using your own symbols, photos, pictures or drawings.
Choose Edit > Edit mode (F2).
Select the cell with the symbol you want to edit.
Do one of the following:
Click the toolbar in the field, and enter the name of the new symbol.
Click on next to the symbol cell. The symbol window appears. Select the new symbol.
Tip: You can quickly edit the symbol in the cell using a symbol with the same name. Select the cell and press Ctrl + Up Arrow for the previous symbol in the list or Ctrl + Down Arrow for the next symbol.