To modify or delete a template you have to:
Open Crono and go in the Template page: here you will find all you need to create a Template.
To modify a Template choose the blue icon located on the left next to the template you wish to edit.
Make the necessary changes and save them by selecting the Save button at the bottom right.
To delete a Template you have to select the red icon located on the left next to the edit template button.
Finally, click on the red 'Delete' button to confirm.