My China Unicom mobile phone received a text message saying that I can use 50 points to redeem a 5 yuan gift card worth buying. How to redeem it?

Event time: During the event from August 21, 2018 to September 30, 2018, China Unicom users can use China Unicom 50 points to exchange for a 5 yuan gift card. The gift card is limited to 4,500, first come first come First served. The contact method is text message. China Unicom users click on the text message link and use 50 points to redeem. After the redemption is successful, they will receive a second text message. The user clicks on the link in the second text message, fills in the mobile phone number at the top of the page to authorize and receive the gift package. Then log in to the "What's Worth Buying App" and click "My → My Messages" to view and use the 5 yuan gift card.