Set up the action
Add the action
While editing a Workflow, click the + button between existing blocks. Select Add Labels to Gmail Message from the action list.

Rename the action (optional)
Click the action name to give it a more descriptive label for easier reference.

Toggle on add labels to trigger email (optional)
If you’re using this action with the New Email Received in Gmail trigger, enable Add Labels to Trigger Email to automatically apply labels to the email that started the Workflow.

Enter the email (optional)
Enter an email ID manually, use a variable from previous steps (such as the message ID from a trigger), or click the list icon to search and select an email from the trigger.



Related
New email trigger
Trigger a Workflow when a new email is received.
Send email with Gmail
Send an email from a Workflow.


