How To Tag Existing Subscribers
With bulk actions, tagging existing subscribers is easier than ever!
On your Subscriber page, you can use the checkboxes to select your subscribers.
If you are adding all subscribers, select the checkbox at the top, and click the link "Select all XX subscribers in your account."
Note: if you are adding subscribers from a specific tag, you'll want to click the tag and open that to select your subscribers.
Select your tag or tags from the menu.
Hit 'Save' & Voila! Your subscribers are now tagged.