To add Font Defaults to your forms, click on Setup and then Brokerage from your dashboard.
Once in Brokerage, click on the Forms tab.
Here you can choose the font style, size and color that you want your fields in your forms library and transaction documents to be automatically created with.
Be sure to click save at the bottom after you have selected your Font Defaults. You can also restore font defaults by clicking the Restore Defaults button next to save.