BibleTime is a KDE program and is integrated with the KDE desktop. You can launch BibleTime from the KDE start menu in the applications group.
BibleTime can be launched from inside other window managers (like gnome) providing KDE is installed. You will need to install your own icon to launch the program. See the window manager help files to see how.
BibleTime can also be launched from a terminal command prompt. To launch BibleTime open a terminal (any Xterminal) and type BibleTime.