When typing, how insert letters instead of typing over existing?

D

Dizzy S

When typing, sometimes what I type overtypes, or replaces, material. I want
it to insert instead. I assume there is a control that selects this but I do
not know where to find it.
 
V

Van T. Dinh

Normally, the Insert key is the toggle switch that allows you to alternate
between insert mode and overtype mode. This, of course, depends on the
software you are using (which I don't know).
 
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