I uploaded some images and then I noticed the model release was too blurry to read.  I want to edit the pending images to attach a clearer model release.  I can't seem to find a way to do it on BS.  Is there a way?  I just want to prevent them from being rejected for unreadable model release.

There is no option.

After so many user complaints they introduced the ability to edit your online images. But still no chance of editing uploaded and pending images.

A quick solution is to write to support to delete your file and then upload the file again and make all the things good.

Don't worry, they won't reject the image if it is 'good enough' for their library. What they will do if they aren't happy with your release is bump the image back to the uploading area where you can attach a release to it - no need to upload again.