Choose the section "Media Library" to add your uploaded images or videos. Click "Own content" to get to the file you wish to add or use the search bar to find the file name. You can switch between folders by clicking the folder symbols.
You can drag the content directly to the content list of the playlist when holding the mouse button down. Otherwise you can select several files and drag them into the playlist together.
Click the button with the check marks above the list to save the playlist changes.
Add a website to the playlist: Drag the website-image via Drag & Drop to your playlist. A pop-up window opens and you can insert your desired URL (i.e.: www.viewneo.com) and click "Save" to add the website to the playlist.