The Blinky Bar
The blinky bar became an line under every word I click and deletes things in front of what I am trying to type if I am trying to type in the middle of a sentence. Please help, I think it is a CTRL + another key command because I was holding control when it happened. Thanks for helping!!!
It seems you may have unwittingly pressed the Insert key and put the editor in overwrite mode rather that insert mode. Try pressing the Insert key again to see if that solves your problem.