You can use your previously created templates and update them with current information to create new slides.
Simply put your template in your playlist by drag and drop. A pop-up window will show up where you can edit your template. Choose a picture or/and change text of your placeholders. Saving the changes to your template will add it to your playlist. You can repeat this procedure as many times are you like, every time you need to add new content to your template.
Last but not least, don't forget to save your playlist.