hey there _aleksander_,
Thank you for using the Apple Support Communities!
It sounds like you're trying to See or cancel your subscriptions but the page is loading blank. This is happening when you try from your PC as well as your iPhone. We'd like to help.
If the behavior is still happening, we first suggest starting off simple with a restart of your PC, and iPhone Restart your iPhone. Then, try accessing your subscription page once again. If it continues, see if you can connect your PC and or iPhone to a different Wi-Fi network. This can help rule out a communication issue within your network connection.
If troubleshooting steps are still needed at that point, you can try the steps in this article next: If you can't connect to the App Store, iTunes Store, or other Apple services. This can help resolve the issue you're facing too.
Keep us posted. Regards.