vb4 and your using this mod ??
https://vborg.vbsupport.ru/showthread.php?t=235218
there is no button in the navbar Default when you install it on vb4
are you using vb3 ?
if your using that mod then you need to go into the admincp Plugins & Products Plugin manager
Navbar Arcade Tab click edit
find this line
Code:
$template_hook['navtab_middle'] .= '<li'.$tabselected.'><a class="navtab" href="arcade.php">Arcade</a>'.$tablinks.'</li>' ;
and change Arcade in that code to what ever you like .. save,