If your album was rejected, you'll need to delete and re-upload your release in order to fix whatever was flagged during the review process, unless stores require verification - if you receive a verification request, please do not delete your upload. For more information on how to verify an artist name on DistroKid, click here.
If your release was rejected for an artwork issue, you can also replace the artwork on an existing release to make corrections. On your album page, click "Replace Artwork" on the right side of the Artwork section to update your album artwork:
For more information regarding album artwork requirements, click here.
Keep in mind, each store has very specific guidelines for how releases are formatted, and what kind of content they'll accept.