How to add this sign (") in unity mono-develop c+ script ?

hello,
I was following a youtube tutorial for making an FPS with Unity.
He said that we needed to open a C+ script to make the character move.
But when I needed to write this: Float forwardspeed = input.getaxis (“Vertical”).
he didnt entered the sign in front of vertical and after vertical.
Please help me else my charcter won’t move.

Monodevelop have some kind of weirdness with latin keyboards.

This other question have a workaround that worked for me (even tough is not really a solution)

Your keyboard should have a key with the " (double quote) character on it. Different keyboards have different layouts. That character on my Mac, which has a UK keyboard layout is to the left of the L key. So, you go find your double quote key. All easy so far. Now, some machines try too hard to be clever, so offer to convert a double quote into something called a smart quote. So, on your machine when you enter a double quote, you might get a Unicode ‘LEFT DOUBLE QUOTATION MARK’ (U+201C), and when you enter another double quote you might get a Unicode ‘RIGHT DOUBLE QUOTATION MARK’ (U+201D). These are just quotation marks which look prettier, but completely mess up applications designed for code entry. So, find a way to turn off smart quotation marks. On a Mac that’s under System Preferences->Languages & Text → Text tab.