On a tile-based Place, click the Manage button in the place banner. Select Edit Page if you are on a Page or Settings if you’d like to add the Video Tile to an activity page.
Your Place or Activity page is now in Edit mode.
Find a vacant tile zone and click Add a Tile.
In the Categories column on the left, select External Add-ons.
In the tile column on the right, select the name of the tile you’re looking for. For example, SE Video.