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Go to the Pinterest website. Click the "Profile" icon. Click Following. Click Boards. Click Unfollow beneath a board.

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It's located at https://www.pinterest.com/. If you're already logged into Pinterest, this will open your home page. If you aren't logged into Pinterest, click Log in in the top-right corner of the page, enter your username and password, and click Log in. This is the person-shaped icon in the top-right corner of the page. It's to the left of your profile picture, which is on the right side of the page. This tab is below the "Following" heading on the left side of the page. Doing so will unfollow the board without asking for confirmation. You'll be able to click Follow under the board to re-follow it if you unfollow a board by mistake.