@LT21
Have you ever used your second home as a rental? If not, then simply enter the sale in the screenshot in your post that you refer to as N+2.
Select I'll enter one sale at a time and then proceed through the screens. For the description, you can use the address or just "second home" - basically whatever you like.
The sale will be reported properly provided you have a gain (if not check the box indicating the loss is not deductible on one of the screens that follow).
