How do I view Mails sent to @privaterelay.appleid.com.au on my PC?

how to I get emails supposedly sent to *@privaterelay.appleid.com.au. when I check iCloud mail there are no such messages. Is there a specific method to access these emails? If so, would someone be kind enough to send the necessary steps to me. I would appreciate all the help I can get. I have basic computer skills but sometimes explanations have me saying what the heck or how do I implement that.