chéngshuāngzuòduì
ㄔㄥˊ ㄕㄨㄤ ㄗㄨㄛˋ ㄉㄨㄟˋ
Simplified 成双作对
Taivo → Settings → Partner inbox → Make the link. It stays in this browser.
Keep 成雙作對 and it comes back until you know it.