Find the person and tap next to their name, then confirm. On Desktop:
If you remember the username of the blocked person, you can unblock them directly from their profile page. This method works on both desktop and mobile: how to unblock someone from pinterest
To unblock someone on Pinterest, you can either search for their profile directly or manage your full block list through your account's privacy settings. Once unblocked, that user will regain the ability to follow you, message you, and interact with your Pins. How to Unblock via Settings (Full Block List) Find the person and tap next to their name, then confirm
Open the Pinterest app and tap your (bottom right). how to unblock someone from pinterest