As a trainer/expert you need a smart phone and a computer or a tablet. In your smart phone you have the mobile app, and this is where you manage your profile and your booking requests. After accepting a lesson request to coach digitally or a request to submit feedback on a video, the web app on the computer or on the tablet is where you perform these tasks (see “Trainer Log In” in the top right corner on this page) as the image is bigger and the feedback can be written with the help of a keyboard.