Here are the steps to customize the size and style of your fonts on your website.

1. Go to your Dashboard and click on "Plugins -> Add New".

2. Go to the search bar in the Plugin section and type in "Font", and all plugins related to fonts will appear.

3. Choose the plugin of your choice and click "Install Now."

4. Then, click on "Activate".

5. It should show up on your WordPress Dashboard, so now you can feel free to customize it.