Press "p" to start autopilot or if you want to do it manual, press "k" to retract the arms and use the arrow keys to control the R7. Sooner or later, you'll be able to reach orbit.
Finally, a project! :D All the art and coding was by me. Thanks to @Lost-in-Space for the background music and @griffpatch for the lighting. I updated the thumbnails so you don't have to wait for it to hide anymore. Check out my other Sputnik 1 project > https://scratch.mit.edu/projects/155912984/