While at home connect you device through HOME.on the computer.
Click on Operate my GO
Click (Set current location), below the screen and then
Click on the Home icon.
If it shows you Old Home location, click (Set current location) again and use Recent destination or Favourite or just go to Address > Street and house number and enter your address.
That said I don't use my home as the TomTom home address, I use a nearby entrance to the Freeway.
If my car ever gets stolen with my 930 in it at least they don't know where I live; FWIW.