You can only add multiple MLSes to your profile if we are PRO in your markets.
Android
- Go to your profile
- In section that states "My Agent-Only Profile" click on Edit MLSs
- Click on your verified MLS
- Now tap "Add MLS Identity"
- Follow prompts
Iphone
- Go to the "Me" tab on the bottom right side of screen
- Scroll to "Manage MLS Identites"
- Click the plus sign in upper right hand corner
- Pick MLS identity and follow prompts