To change home location:
From the forecast screen, press the symbol showing two pages overlapping (on lower right).
Flip till the last page, Settings (as indicated by gear symbol).
Press the minus symbol (-) below the list of cities.
Three gray bars will appear to the right of each city on your list.
Press and hold the three gray bars of the city you want as your home location.
The city should darken in color, allowing you to drag it to the home location box, replacing whatever city is currently there.