The following reassigns macros to the 3 function keys:
Sub turnOnF2()
Application.OnKey "{F2}", "HelloMacro"
End Sub
Sub turnOnF3()
Application.OnKey "{F3}", "GoodDayMacro"
End Sub
Sub turnOnF5()
Application.OnKey "{F5}", "SeeYouMacro"
End Sub
=============================================
The following are the actual macros themselves that enter the text:
Sub HelloMacro()
ActiveCell.Formula = "Hello"
End Sub
Sub GoodDayMacro()
ActiveCell.Formula = "Good Day"
End Sub
Sub SeeYouMacro()
ActiveCell.Formula = "See You"
End Sub
=============================================
The following allows you to return the function keys to their
original state:
Sub turnOffF2()
Application.OnKey "{F2}"
End Sub
Sub turnOffF3()
Application.OnKey "{F3}"
End Sub
Sub turnOffF5()
Application.OnKey "{F5}"
End Sub
=============================================
Type this macro in the VBE, then exit the VBE back to the worksheet
screen.
Sub GoodLuckMacro()
ActiveCell.Formula = "See You"
End Sub
Now do the menu sequence Tools>Macro>Macros, and find the macro
in the list. Click it just once just to highlight it. Click the
Options button.
Enter a lowercase "k" for the shortcut key. This assigns Ctrl+K as the
shortcut key to enter the text "See You". (If you enter an uppercase
"K", then Ctrl+Shift+K becomes the shortcut key.)
I hope this helps you.