If your shein return label not showing up when you try to print it, there are a few things you can try to resolve the issue:

1. Check your email: If you chose to have SHEIN send you a return label by email, check your email inbox (and spam folder) to see if you received the label. Sometimes the label may have been sent to a different email address, so make sure to check all your email accounts.
2. Check your order history: Log in to your SHEIN account and go to your order history. If your return label is not showing up, click on the "Contact us" button to speak with customer service. They may be able to help you generate a new label or provide further assistance.
3. Try a different browser or device: If you are having trouble accessing or printing the return label, try using a different browser or device. Sometimes technical issues can occur that may prevent the label from displaying properly on certain devices.
4. Contact SHEIN customer service: If you have tried the above steps and are still unable to print your return label, contact SHEIN customer service for assistance. They can provide additional support and help you resolve any issues you may be experiencing.

By following these steps, you can troubleshoot any issues you may be having with your SHEIN return label and ensure that your return process goes smoothly.