To add youtube/embed video please follow the below method
Login to control panel, and visit the home page of your site.
You will found an option 'Dashboard' on top of the homepage. If you are unable to find the 'Dashboard' option on the home page then please check that the 'profile' page must be there.
Click on Videos option and then click on 'Add Video' Button. Enter the detail on the popup page (see attachment)