After login you will be able to see your approved RMAs if any.
If an order is eligible for return and you approve the return request, your customer will receive an email with the return instructions and an RMA number. You can customize this email from Your Account.
Here's a tip how to make sure that your products are returned safely: always include specific instructions on how to pack your merchandise properly, this applies especially to fragile items.
For example you could ask your customers use materials that would protect an item from damage while in transit: