Find your signature card first. . Then press Use. . Then go in. . Sign the card. . I used to get one free when I was over 30 . I don't think so now. . But there is also a time limit for signature cards. . 1 month. . It's no use. . You can go to Taobao if you want to buy it. . They sell it there. . The price is about 5 yuan RMB.