If using the master uploader application - To re-upload the correct files, you would launch the Master Uploader App and then repeat the process as you had done before--the new files you upload will replace the old files. Then you can return to your account and continue with the project from there.
If you've upload individual tracks - Log into My Account and click on Continue project. Click on Content. Select the upload submission method on the left side of the page.
Delete unwanted tracks and re-upload the correct tracks and continue with resorting your tracks and CD Text and completing your IPR form, as before.
If you've uploaded a DDP - Delete the file that you've uploaded, entirely, and re-upload the new files.