Deleting a template

Unless you are a project administrator you can only delete templates that were created by you. Read more

Open "Manage Templates" dialog:

or go to "Checklist Templates" page:

The screenshots below were taken from Manage Templates dialog but the process is identical on Checklist Templates page.
Click "Delete" on a selected template (you can delete only your own templates, unless you are a project administrator - read more):
If template to be deleted is used as the default checklist in other projects (i.e. other than the one you're currently in) you will need to confirm your intention:
Templates aren't removed straight away after you click "Delete". You can undo that operation as long as the dialog / page remains open.

If you don't undo the deletion, the template will be permanently removed after you close the dialog or navigate away from the page.