fx-82MS fx-82TL fx-9860GII TI-83
INS
On a Casio calculator you can insert a digit or function at the current cursor position
INS UNDO
SHIFT DEL
and the blinking insert cursor ► will then be displayed. By pressing again or with EXE you come back to the normal cursor.
Example 1
To change the calculation 1 + 
to 1 + 
where the input cursor ► is displayed
REPLAY INS √ ◁◁ SHIFT DEL 1+► SHIFT x² 1+