how do I stop letters from deleting each time I add words?

[Yuliya Atzil]

If I have just finished typing a sentence and I realised that I forgot to add
a word in the middle of this sentence, when I try to add an extra word, the
next word till automatically be deleted depening on how many letters I have
used for the previous word. how can I stop this.?

 

[Herb Tyson [MVP]]

You need to toggle out of Overstrike mode. Ordinarily, you do this by
tapping the Insert key. Look at the status bar at the bottom of the Word
window. There should be an indicator. If the Insert key isn't working, you
should be able to click or double-click the indicator on the status bar to
toggle, as well.