How do i get the mercy sprays/icon?

Would someone be kind enough to explain how i can obtain the pink mercy sprays/icon

Simply log onto twitch.tv and link your Battle.net account. Then find any of the eligible streamers during the promotional period and watch up to 6 hours of their content to earn the rewards. Full details in my Twitch Rewards guide here (yes updated with information for the Charity Streams):

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Have a Twitch account. Connect your Twitch account with your Battlenet account. Watch the streams listed for the charity.

https://us.forums.blizzard.com/en/overwatch/t/pink-mercy-twitch-drops-faq/93784/3