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.