Here we're going to talk about another method, to add tag directly on Audience page

Step 1:

Click「CRM」，go to Contacts page

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Step 2:

Move the mouse to the contact you want to tag, you will see a box on the left side of the contact, click to select

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Step 3:

After selecting multiple contacts, click the "+" above

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Step 4:

At this point, you can click to select the label to add from the list of existing labels, or enter a new label in the input box

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Congratulations!👏