You can freely edit the metadata of the record (i.e. title, authors, etc) at any time, even after publishing it, by clicking the orange "Edit" button on the top right of the record's page (you have to be logged in with the account that created the record). After the changes are made, you need to click "Publish" again.
If your record is less than 30 days old, you can additionally modify the files as well: