Editing a draft template
WhatsApp templates that are in draft status can be edited. To edit a template, go to your templates click on the "Continue editing" button found on the menu to the right of the template.

Editing an approved or rejected template
WhatsApp templates that have been approved or rejected cannot be modified. If you need to make changes to a template, you can choose to duplicate the template using the "Duplicate" button found on the menu to the right of the template. This will create a new template with the same content as the original one, ready for you to make the necessary changes.
