Well I see my screenshot could not upload as it should. The text in the footer is grey (i added a text widget in one of the 5 rows but this is standard light grey. But I have darkgreen background so it’s not very visible. You have some code?
You can change the font by means of the Advanced typography option, which allows you to choose the item from a drop-down or insert your custom CSS class. Please navigate to the Theme Settings > Typography > Advanced Typography.