Hey Denise,
If you added a document in Confluence as a attachment then all you need to do is to remove it from the attachments section of the space where the page is located as you can see in this page.
Now if you imported a document into a page then you will need to delete the page itself.
Also for your next answer posts make sure to explain better what is your scenario so we can know for sure what exactly you are facing.
Thanks and Regards,
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