To bulk tag a specific set of contacts, first, search for the contacts you want to bulk tag. Select from the search the contacts that you want to bulk tag. If none are selected, all will be tagged. In the Actions button, select Tag All.
Then either select tags from the dropdown or type in a custom tag to add to these contacts. Then click Add to add these tags to the contacts. You will get an email telling you how many of each tag was added to the contacts.
You can also bulk untag contacts as well.
To bulk tag a specific set of contacts, first, search and select the contacts you want to bulk untag. Then in the Actions button, select Untag All.
Then either select tags from the dropdown or type in a custom tag to remove this from the contacts. Then click Remove to remove these tags to the contacts. 