If you have Android phone:

- Install WatchMaker app from here

- If you have Android Wear or Ticwatch2 watch the companion app on watch should automatically install - use the Android Wear app on your phone to make sure your watch is connected to your phone

- If you have Samsung Gear S2/S3 (Tizen), get the companion app by installing Samsung Gear app on your phone and search for WatchMaker

If you have iOS phone:

- Install WatchMaker app from here

- Full instructions on installing WatchMaker for your watch are here