Adding missing tags involves several steps: - Identify the Placeholder: Determine the type of tag you need (e.g., first name, last name, dynamic content). - Insert the Tag: Most email marketing platforms use specific syntax for tags. For example, in Mailchimp, you might use `*|FNAME|*` for a first name tag. - Test the Email: After inserting the tags, send test emails to ensure they populate correctly. - Review Data Sources: Ensure that the data source you are pulling from contains the necessary information for the tags to populate. For example, if you are using a first name tag, make sure the recipient list includes first names.