Question: 0-level question about correcting input

Maple -u enters an edit mode upon detecting a syntax error. It displays the offending input with a cursor on the character where the error was identified. You can insert text before the cursor. But what else can you do? How can you change the marked character? How can you get out of edit mode? I have been unable to find anything about editing in either the user manual or online help. So I need an editing primer or a pointer to one.

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