The Mevo app will default to whichever Facebook account is logged into your mobile device's browser.
If you wish to stream while logged into a different account, launch the browser app and navigate to facebook.com.
Select the navigation menu in the upper right corner.
Scroll down and tap Log Out.
Close Safari and launch the Mevo app.
Once you are connected, tap the red button, followed by the Facebook Live logo. You will then be prompted to log into a Facebook account.
If you are instead prompted to confirm your Mevo login to your previous account, select the Safari icon on the top right.
You will be brought to your Safari and will be able to login to another Facebook account.
Alternatively, you can clear your Safari browser's history and website data in the iOS device settings. This will also log you out of your Facebook account.