Overtype / Insert Key / Overwrite mode on MacBook Pro?

Does anyone know if there is a way to get the Scriptcase editor to go into “INSERT” or “Overwrite” mode? I want to be able to type over existing text rather than add text in front of it.
I have googled it but nothing I find seems to work so I wonder if the editor itself somehow has a keyboard shortcut to enable it?

Thanks for any suggestions!

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