You chuck it into orbit!
![Surprised :o](./images/smilies/icon_e_surprised.gif)
More precisely, SpinLaunch puts the satellite plus a small rocket into a dart, which they attach to the end of a 100m arm and spin up (in a vacuum) to 10,000g, and fling the dart out and up at 5,000mph. Once clear of the atmosphere the small rocket takes over to get the satellite into its correct position. Launch cost $0.5m vs typical $7m.
https://www.bbc.co.uk/iplayer/episode/m00142dw/click-swingin-satellites (first 7 minutes or so)
https://www.spinlaunch.com/ (I hope their accelerator tech is as good as their ability to make glossy videos!)