Board Thread:Support Requests - Designing Your Wiki/@comment-37172522-20190423175228/@comment-9605025-20190423231054

Applemasterexpert just gave it to you. To import from Google Fonts, put the following at the top of your CSS. You can read this help page for more information. However, as RickGT already mentioned, it is against Wikia's Customization Policy to change the font of the wiki's name in the wiki navigation bar.

However, based on the site you linked to, it looks like you mean the "text" all the way on the left side of the navigation bar. That is not actually text, it is an image. It is called the wordmark and you can change it using Theme Designer. You can read about the details here.