How do I assign two functions on a single key

Hi. I would like to know how to set a function where pressing F on the keyboard will change a textbox to display "Auto" and pressing F again will change the textbox to display "Manual". Thanks.

If Textbox = Manuel

---Set Textbox = Auto

Else

If Textbox = Auto

---Set Textbox = Manual

If Textbox = Manual

--Set Textbox = Auto

Else

If Textbox = Auto

--Set Textbox = Manual

Thank you so much both of you. It took me a while to understand how to apply such logic in construct 2 layout, but I finally get it:

It's not what I asked for in the first place, but the theory is similar