You can add multiple tags to your account with the Tag Manager.
To learn how, follow these steps:
1. Click "Contacts" to navigate to the Contacts overview page.
2. Click "Manage Tags" on the left side menu.
3. You will be directed to the Tag Manager page. Paste your tags into the "Add Tags" box on the left side of the screen. Make sure that you either have one tag per line:
Or that they are separated by a comma:
4. Click “Add Tag.”