Adding your Custom Font
You can add a custom font of your content by going to Configure > Themes > Edit > Scroll down to the 'Text' box > Click on the drop-down menu > Custom > Add New Custom Font.
A pop-up will show so you can name the Font Family. The Custom CSS will be set for you in 'Comment' Mode until you remove the slashes (/) to make them effective.
Once the Slashes (/) are removed, you can click on the Add Font Button.
You will be able to see a preview of the changes that you have made to the font on the right side tab.
And lastly, don't forget to click on Save to keep the changes.