This is related to the language/keyboard layout on your computer.
There's usually button combinations to change the keyboard layout, but it differs a lot from computer to computer.
Me for instance use a Swedish keyboard layout, when I want to do certain symbols I have to use shift + alt to change the layout, an example is when making a question mark "?" in standard layout, it becomes an underscore "_" when I use the exact same key only because I changed the layout.
I'm afraid I don't know which buttons you need to use for it to work in your case, maybe someone else knows though or another way around it.