You will need to define the schedule as a Traveling schedule in order to assign home fields to your teams.

Select the schedule you want to change from the list and then click on the Schedules button. Click on Change and then change the schedule type from Regular to Traveling and click OK. The schedule will now display a (T) next to its name, denoting it as a Traveling Schedule. Click on Close.

Go into the setup of that schedule and click on Teams. Under the teams list you will now see a Home Locations button. Click a team then click the Home button to choose a home location. Repeat for all the teams, you will see a (H) for each that was assigned.

Next go into Game Times and assign the times teams can play their home games.
A note on setting up Game Times...
If you have teams that share a Home Location, those teams cannot have the same Game Times setup, the game times setup for those teams must be unique. If you have some questions on this please let us know, there are ways around this.

Enter any exceptions, a start date and your options and then compute the schedule.