Step 1: Open the Divi Visual Builder and go to any design section that shows a font.
Step 2. Click “upload” and select your font(supported file formats are: .OTF, .TTF, .EOT, .WOFF, WOFF2).
Note: If you are getting an error saying that this file type is not permitted for security reasons, please take a look this Tutorial.
https://www.elegantthemes.com/blog/wordpress/how-to-fix-the-sorry-this-file-type-is-not-permitted-for-security-reasons-error-in-wordpress
Need Further Tutorials?
Divi Builder overiew: https://www.elegantthemes.com/documentation/divi/visual-builder/
How to Globally Change the Website Font in Divi: https://bit.ly/2rElDxI
How to edit texts: https://bit.ly/2speAcO