How to remove all the existing google fonts for the template and add new ones

The theme for my wordpress blog is FASHIONISTAS. I am new to blogging and I just started building my blog earlier. Without knowing that I’ve selected to use too many google fonts, I selected too many fonts and the ones that are available to be used are not the ones I actually want to use. How can I delete what is only display on the fonts menu on the left side of the menu bar and reinstall the fonts that I actually want to use? Thanks!