Facebook Page categories serve many functions. Here at ActionSprout, they also determine your Grant eligibility or not.
To get started navigate to the Facebook Page in question in Facebook. Once viewing your Page, you should find the following menu somewhere on the screen. Choose Page Settings at the bottom of the list:
From the Page Settings screen, choose Page info from the side menu:
This will open the a screen similar to the following:
Under Categories you can add, remove or edit your list of categories. Feel free to apply as many that relate to your Page!