For a Person
Step One: Go to your Dashboard and click "People"
Step Two: Search for the correct person using their name or contact information
Step Three: Click on the person's name to pull up their Person Profile, then click "Edit Contact Settings"
Step Four: Enter the new email address, phone number, or Slack handle in the text box under "Contact Info," then click "Add"
Step Five: If you see an old contact method you'd like to remove, click "Remove"
Step Six: Check to make sure the person's Contact Preference is set to Email, SMS or Slack. If it already is, there's nothing else you need to do. If not, proceed to Step Seven.
Step Seven: If their Contact Preference is set to "OFF" change it to Email, SMS or Slack by selecting from the dropdown menu and hit "Save." Otherwise, they won't receive notifications.
For a Group: