You can amend a trigger email template by following the below steps:
Click System Admin or Configuration, depending on how your system is set up,
Click Content then click Emails.
Click Configuration then click Triggers.
Find and click the template you want to amend and click Edit.
You can either amend the template by amending the text or upload a document that contains the template.
Click Save.
📌Note: If you upload a document as a template, you need to make sure that the document has all the relevant replacement fields.