In the Template Runner, you can switch to the Template Designer to edit the query template.

Prerequisites

You have created at least one query template in the Template Designer, refer to Creating a query template.

Proceed as follows

1. In the Data Explorer, select the desired query template to be edited.
   → The Explore view is displayed.
   
2. Click the Open in Template Designer button to edit the query template in the Template Designer.
   → The Details tab is displayed.
3. Make the changes.
4. Click either the Save button to update the query template which is considered as 'quick save', or the Save with comments button to create a new formal version of the template.
   → The query template has either been saved as 'quick save' version', or a new formal version was created:
   
5. At this point, you can edit the versions, too. Learn about that from Versioning query template user guide.