- How do I set location on Garmin forerunner 45 or on Garmin IQ
If you mean location of your Garmin Profile account, then you can change it at https://www.garmin.com/account/profile/. If you mean the physical location of the watch, then just start the GPS (long press the GPS button) while being outdoors, or start an outdoor Activity, such as Running, Walking, or Cycling.
If you want to see the elevation, open the ABC widget (altimeter/barometer/compass). If you want to see the position, open the GPS widget. If you want to see those during running, you can also customize the data screens of the Running activity, and adding the respective data fields to one of the screens, or adding a new screen for that purpose.