Pros can work Gigs in any city/market that Gigs are posted in. To change your city/market;

1. Tap the three lines at the top of the home page of the app
2. Tap settings
3. Tap the market drop down
4. Choose a new market and tap confirm
5. Tap save
6. Click the X at the top right to go back to the home page

If you confirm Gigs in different markets, those Gigs will all show up on your schedule tab in the app.