First, you'll need a Podcast Index API Key and Secret. Go here https://api.podcastindex.org/ to request your Key and Secret. Your Key and Secret can't have a # symbol in either, because # is interpreted as a comment in the .env file, so a # will result in API call errors. If you're first attempt results in a Key or Secret with a #, delete that attempt and try again.
Next, copy your key and secret into the .env copy file. Rename that file to .env
Now, in your terminal, type npm install.
Once the install is complete, type npm run dev and open your browser to view the site.