Changes in the sidebar-3 (lateral) of my edu-clean theme isn't showing


this is my problem. I'm adding and modifying widgets in the sidebar-3 of the edu-clean theme but the changes doesn't appear on the frontend. I still have the text that tells me to login and add some widget in the admin.
This is the page where it appears: and and everywhere there is that sidebar.

What can i do to check what's wrong ? Thanks !