Scripting issues

[Mechanical]

So I am programing for the first time in Roblox studio, and need some help on typing the code.

Every time I try to insert some code where there is already code it replaces the code instead of inserting it in that space.

It is a very frustrating thing to happen, and I have no clue on how to fix it.
So if there is an expert on Roblox studio here, please help, before I punch my monitor.

 

[C2dan88]

Deactivate insert key?

https://www.computerhope.com/jargon/i/insertke.htm

[Mechanical]

Thank you C2dan88, it was really that simple.