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: The website tagline font is not customisable by you, apart from having the ability to enlarge or format in bold or italic. However, whatever Website Font you select, the tagline font will automatically adjust to match.
See here for instructions on how to change the font of your website content.