Problem with deleting codes

[Sh0Ti]

So, I got this annoying problem - some sort of automatic deletion which for the more experienced people might be nothing but for me ..well i just cant delete or change stuff from codes without deleting the whole code.

Instead of having "|" (the symbol you have even right now when you type something- the thing that shows where your going to type or what your going to delete etc)
I have something like this █ although grey.

For example if i have (completely random pickd)
Cold tea
And i try to add "green" by clicking between the 2 words and start typing
the new word will eat "tea" instead of simply goin between them..

[rafae11]

you probably have pressed the insert key on your keyboard.

[Sh0Ti]

That solved my problem.
Thank you, very much!