Programme Management > Programmes > Find the Programme > Manage Series / Season Videos
Here you will see a list of your series. Under Actions, you can Manage Season Videos
Select + New Video in the top right corner and enter your video information
Your video can be assigned to seasons and episodes that have been created in the system and you have the ability to name your video ie Promo.
Once all information is entered you can choose to make your video public before saving.
Below is how a public video will appear under the selected series