Inside your Hugo site, run the following to clone the Frances theme into themes/frances:
git clone https://github.com/mcrwfrd/hugo-frances-theme.git frances
Inside themes/frances, you’ll find a file called congif.toml. Copy this file to the root of your Hugo site, and customize it as you see fit. Mostly you’ll want to change the name and email address here to match your own.
Additionally, in order to use this theme with your Hugo site, you need to add the following line to your own config.toml file:
theme = "frances"
See Hugo’s quick start guide for more help with adding this and many other themes to your Hugo site.
Finally, test the new theme in your site to make sure it works: