You need two Scratch capable devices (If you have a computer and iPad then download Puffin Free on your iPad for Flash supporting browser AKA. Scratch 2.0 for iPad), Now sign in as a SCRATCHER on both devices, it can't be the same account. Then set one device as the server and one device as the client then when you are ready you slide go from 0 to 1 and it should return a result of the connection speed between the two devices