How to delete the SMS tag in the upper right corner of Hisense TV?

According to your description, the envelope icon is usually an email sent by radio and television. If it is connected to a set-top box, you should use the remote control of the set-top box to view it. Otherwise, you should use the TV remote control to watch. Due to different TV models, the related software functions and operations are also different. I suggest you provide your TV model or call Hisense's national service hotline for consultation. I hope I can help you, and I wish you a happy use.