If you want to change the font of your website logo and short description, you can easily do this within Section 2 - Choose & Customise Template
From the left-hand menu, select Edit Logo.
To change the logo font, simply experiment with the choices available by clicking on the text icon dropdown:
You can also make font bold or italic if desired.
Please note: It's not possible to change the Website Tagline font here, aside from having the ability to enlarge or format in bold or italic. However, you can change it by changing the overall font of your website, because your tagline matches your website fonts (see how to change the font of your website content.). This is to avoid too many fonts being used, which can cause performance issues with your website.