How do I get the textbox to be green when the answer is correct? How do I get textbox 1 to change textbox2 by pressing the tab button?

I can get the text box to be white when it is blank and when there is one character and can get the textbox to be red when it is wrong. How do I get the textbox to be green when the answer is correct? How do I get  textbox 1 to change textbox2 by pressing  the tab button?
textbox.pptm