To begin adding content to your locker, you will first have to navigate to your Profile through the top left menu.

Once on your profile, click the Posts tab under your profile photo.

Here, you will find all the videos and articles that you have uploaded. To save them to your locker, click the Save to Locker icon.

A window will appear with a drop-down of all of the clipboards in your locker. Simply toggle the clipboards that you wish to add the piece of content to.