Re: facebook logo has become my startup screen image in Microsoft Lumia phone I want to change it,
i assume you're talking about the lock screen.
Go to settings > Lock screen
You can download apps that change lockscreen image periodically or choose your own pic.
In case you're talking about home screen you can go to settings > start + theme and change it from there
Re: facebook logo has become my startup screen image in Microsoft Lumia phone I want to change it,
Do you mean its pinned to the start or your actual background? If its pinned, hold down on the logo and press unpin. If its the background, go to settings, start+theme then remove photo.