This cannot be undone! If you want to offer the CD for swapping after you have deleted it, you will need to repost it to your Tower.
Note: If you have clicked "I cannot mail" on a request, or clicked "Cancel" on an active outgoing transaction, or the system has canceled your transaction for failure to complete the sending process by the deadline, the CD involved will have been automatically removed from your Tower.
Related links:
What is My CD Tower?
Can I put my Tower on hold/vacation?
What does *pending request, 1 hr max* mean?
Can I post multiple copies of the same CD?
How do I send one of my CDs to a friend?
How to post a CD
Posting a Wish Listed CD