I see you have an Adobe account under the same Adobe ID as with forums. As you mentioned that you have licensed an image accidentally, I've added an image credit to your account so that you can license a different image instead.
Hope that helps.
Feel free to update the thread for any other concern.
The 10 images free offer works when you subscribe to a Stock plan and we do not charge you the first month which means that you have 10 images in your account for free.
Unfortunately, the image which you have accidentally licensed cannot be unlicensed.
Would you mind sharing the File ID/ image ID so that I can help you further.