If you have completed the retention form for B.Sc. Nursing admission through the CAP (Centralized Admission Process) round and are considering canceling it, here's how you can approach the situation:

1. **Understand Retention Rules**: Retention typically means that you have secured your seat and are committed to continuing. However, if you want to cancel, you need to review the retention and cancellation policies specific to the institution and the CAP guidelines.

2. **Contact Admission Authority**: Reach out to the admission office of the college where you retained your seat. Explain your situation and request guidance on how to cancel the retention and admission. They will provide instructions on the process and any associated deadlines.

3. **Submit a Cancellation Request**: If allowed, you may need to submit a formal cancellation request. This could be a written application or an email, depending on the college's requirements. Include your retention details, admission date (31/08/2024), and the reason for cancellation.

4. **Refund and Consequences**: Inquire about the refund policy and any financial implications. Institutions often have specific rules regarding refunds and penalties for cancellation, so it's crucial to understand these before proceeding.

5. **Follow Official Procedures**: Adhere to all official procedures and deadlines to ensure your cancellation is processed smoothly.

Act promptly and stay in communication with the relevant authorities to handle your cancellation effectively.