Greater than or equal too IF function

Im trying to use the IF function but cant seem to find what the symbol for greater than or equal too is for it. I can get it to work using greater than, but i need it to work with equal too aswell.

Also is there way to make the cell change colour aswell as what it says in a IF function, for example the box turns green when the IF function puts Yes in the cell, and red when it puts no?

Edit: Is there anyway to make certain cells hidden when the sheet is protected?