How do I cancel nebula subscription

While it is not clear if you are seeing this as a charge managed by Apple or not. I suspect what happened is that you were directed to their website from a Social Media link for a free "reading". The poster got a kickback for referring you to that site. Once you agreed to the reading, you also signed up for a free trial and where then charged directly by the company. I understand it may not have been deliberate and they certainly don't make it clear that it is a free trial, but this has nothing to do with a subscription/charge that is managed by Apple. No app is needed for you to receive these charges.

Here is the information Nebula provides about their subscription terms:

https://appnebula.co/tech/subscription-terms

You can check for the subscription here:

https://appnebula.co/cancel-subscription

Their refund policy is available here:

https://appnebula.co/tech/money-back-policy

In the future stick with in-app purchases for any subscription/free trial, so they can be easily cancelled by Apple. When signing up directly with a company, your subscription is being managed by that company and they are billing your card directly. If you are unable to get a refund with Nebula, then you will need to dispute the charge with the bank of the card being billed.

Hello!

See if this helps: If you want to cancel a subscription from Apple - Apple Support

Have a great day!