Hopelessly basic question

Hi all--

after I enter text while creating a slide...if I go back in and change the text--delete a word, then start typing--instead of inserting the new text, it types over the existing text.  I couldn't find anything on this in the forums (I've found lots of things about "backspace" not working for the end-user, but not this problem). 

Could someone help me with this?  It's just started happening, and I'm sure I hit some bizarre alt+ctrl combo by accident.

Thanks!

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