Q. I have one. You must see the entire enclosing rectangle without scrolling. You might try lower case. A. Only letters, space bar, arrow keys, backspace and a mouse click are recognized, normally. A. Use mouse or arrow keys to change location.
Backspace reverses direction.
If you are filling in a word, just start at the right place and type it. So you need not look at the screen, or skip over letters already there, once you've started a word. If you see one yellow square, you will move across. If you see one turquoise square, you will move down. The single yellow or turquoise square.