Editing an Indesign template is possible by clicking on ‘Maintenance’ on the top row and afterwards on ‘Template Builder’ on the left. In a new screen the template builder will open.
Click on ‘Templates’ and in the dropdown menu ‘List templates’.
Double click on a template you wish to edit. The template will open and you can make the necessary changes.
Once you have finished editing your template click on ‘Templates’ and select ‘Save & export’ from the menu.