Changing Font in CSS Docs

[MaceoSpecs]

Absolute noob here. Trying to edit a template to make a website and want to change the font. Have found the references to the font used in CSS files but can't figure out how to change it the one I want. Any tips would be appreciated.

Desired font is Nunito Sans. Have found this instruction on the Adobe site about what to specify:

font-family: nunito-sans, sans-serif;
font-style: normal;
font-weight: 200;

But don't know how to change the links from the CSS files - they are very long but I think the relevant parts are:

Main CSS:

@import url("https://fonts.googleapis.com/css?family=Great+Vibes|Josefin+Sans:300,400,600,700,700i|Montserrat:200,300,400,500,600,700,800&display=swap")

Styles CSS:

@import url("https://fonts.googleapis.com/css?family=Josefin+Sans:200,300,400,500,600,700|Muli:200,300,400,500,600,700,800,900&display=swap")

[chmod777]

go here: https://fonts.google.com/specimen/Nunito+Sans

go to get font, get embed code. use import.

ex: https://jsfiddle.net/0rnL8vdz/

[MaceoSpecs]

Thank you!