I. Function Keys
D. INS and DEL (insert and delete)
The insert and delete options allow you to edit an entry and re-enter it as many times as you need.
The cursor changes when the INS option is activated. The default for the TI-86 is type-over mode. When you have accessed INS, you can type any additions or corrections and then hit ENTER to evaluate.
Default: Cursor is solid. Insert: Cursor will blink.