How to edit font style, font color, and font size

Settings for changing sitewide fonts as well as colors and other design options are found in the main menu on the left hand side of the page:

Design > Site Styles > Search "Fonts" > Select any option > Choose from font options. 
Here's a great video showing the steps: https://www.youtube.com/watch?v=qDqeeCuM-fY.
If you're new to Squarespace, we recommend checking out Getting Started With Squarespace, as well as the tutorial videos included with your purchase.
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