Unexpected charges – app nebula hard to cancel

I tried the Nebula app after a small initial payment, but later noticed recurring charges I didn’t clearly agree to. The main issue is cancellation: inside the app there’s no clear option, and the external flow is confusing.

After reading other Nebula app reviews, it seems many users face the same problem. If anyone knows a simple way to fully stop the subscription or has experience resolving this, please share.