Changed my WordPress theme for the first time earlier today in my profile settings.
- Go to https://aprykhus.wordpress.com. In your case it’ll be your WordPress username for the subdomain
- Click on your name in the upper left
- On the right click Select your theme.
- That takes me to my Manage Themes page.
- You can repeat these steps yourself. Just replace aprykhus with your wordpress username in the URL in the web browser’s address bar.