For anyone that wants to change their “Big Title” fonts and others, all you have to do is download the Typekit Font plugin. Make sure you download the official one. Afterwards, get the embed code using typekit by going here: https://typekit.com/fonts/
There you need to create a kit and it’ll give you two lines of embed code. Go to settings of WP dashboard and click on the TypeKit. Paste the two lines of code and save it. Go to Appearance>Editor and on the style sheet, change whatever font you’d like to change. You can find out what the name of the CSS would be by inspecting the element on Google chrome by highlighting it. Afterwards just put Font-Family and whatever your font is from the TypeKit and voila! Your font has been changed! Hope this helps!