Let's say you created a template you no longer wish to use, you can easily delete it by going to the template dashboard!
Here's how:
Go to the templates section in your MURAL dashboard
On the second tab, you will see templates specifically created for your workspace
Click on the dropdown arrow on the thumbnail
Select delete template
*Note: deleted templates can not be recovered. MURAL templates also can not be deleted from the workspace.
For more information on templates, check out the article Templates in MURAL.