The app will follow your device’s location by default, but if you go to the Profile tab on the Settings screen (tap the button at the top left of your screen when logged into the app, then tap the Profile tab), then scroll down and tap on Travel Planner button, you can set your profile to appear from an alternate location of your choosing. To do this, check the box next to Show my location as and enter the name of a city (e.g. Seattle, WA) and then tap the back arrow. You will then see a confirmation dialogue asking if you want to set your location to the location you’ve entered. Select Use Location to confirm and then you can browse #open as if you were in the city of your choice. When other players view your profile, they will see you as currently traveling to the location you provided.
Note: you MUST tap the back arrow for your location change to be confirmed and take effect.