Is it an embedded code link you added from the Add Section?
If so go to Online/Website/edit site.
On the Right hand side that shows your page highlight the link, a blue box should appear around it.
Then on the left hand side the embedded code section will appear, scroll to the bottom and click delete section. It will ask if you want to delete, click delete again.
Then click on publish in the upper right hand corner and it should be deleted.
