Below the details, there is a "mediation center". Click on this "mediation center" to enter.
Is the reason for choosing a refund, including not receiving the item, or the item and description are different. Then, if you need to describe the problem, you can write down your reasons for refund before submitting it.
Precautions:
PayPal disputes must be initiated within 45 days after the transaction, and it will be invalid after this time;
Try to write down the reason for your refund. PayPal may ask you to provide some evidence of the transaction. Therefore, it is very important to keep evidence that is beneficial to you. If the counterparty is not in China, please fill in the reason for refund in English.