To begin editing using the mouse:
Select a row.
Click on the respective cell.
Click once more to open the editor.
To edit using the keyboard:
Depending of the value of RadGridView.BeginEditMode property, start editing by pressing F2, Enter or by any keystroke.
Press Escape to cancel editing or Enter to confirm the new value.
While in edit mode, use Tab and Shift-Tab to navigate to the next and previous cells of the current row.
Use the arrow keys to change the current row.
Use the Delete button to remove the current row.
See the Keyboard Support topic for more information on navigating using the keyboard.