Please upload your video to either Vimeo or YouTube. Once your video is uploaded, you can embed it here by following these instructions...
Click the 'Share' button under your video, then click the 'Embed' button which appears under this. Copy the code from the box which appears underneath the 'Embed' button (starts with '<iframe...'), then paste this code into the 'Video link' box on this form.
Click the 'Embed' button to the right of your video, then in the pop up window which appears, copy the code from the 'Get the embed code' box (starts with '<iframe...'), then paste this code into the 'Video link' box on this form.