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Method 1：
Step 1:
Click「Inbox」，go to Inbox page，find the related chat, go into the chat
Step 2:
Click X at the top right to delete a tag
Method 2:
Step 1:
Click「Audience」, go to Audience page，find the related contacts，可參考How to search a contact
Step 2:
After you find the specific contact, click X at the top right to delete a tag
