Board Thread:Support Requests - Designing Your Wiki/@comment-33688175-20200317170752/@comment-39340968-20200403215709

I think this should help better: On the “Your Collection” module, click “@IMPORT”. This will display a snippet of code that includes the syntax, @import url('https://fonts.googleapis.com/css?family=Font+Name'); where Font+Name will be the name of the font you chose, with spaces in the name replaced with the plus sign. Ignore the and lines, but copy the @import line of code and paste it at the top of your community's CSS page. After the cache updates, which can take up to several minutes, your new font will be ready to use.

From Help:How to import Google Fonts