What logo are you refering to?
Do you mean the one in the menu before you enter the game?
If that is the case look in resources/gui/MainMenu.xml
Look for <Logo>, under it you will find <Hidden>False</Hidden>, change it to <Hidden>True</Hidden> to hide the logo.
You can also look for <Bounds>131,0,762,262</Bounds> under <Logo> and change the possition of the logo if that is better then now showing it.