Login to your WordPress dashboard and click on Plugins → Add. Then click on the Add New button at the top.

install plugin

In the next screen, click Browse button and choose the plugin ultimate-fonts.zip file from the download package. Then click button Install Now.

upload plugin

When the upload finishes, click Activate link to activate the plugin.

activate plugin

Done! Now you can see a new menu on the left Ultimate Fonts. Explore the plugin settings now.