Hawea: Changing the font

Hello, I have been trying to modify the font of the Hawea theme using the Easy Google Fonts plugin. However, it does not change the top menu fonts nor the footer credits… I don’t know what to do.

I have been trying to modify the css but still does not work. I have looked through many tutorials of how to do it…

Could you tell me a specific line that I should modify? I have also tried to input the API key in advanced settings of the plugin, but no luck either.

My website: http://www.peoplesplants.net