You need to tell us how you start X11. If you use a display manager (XDM) or startx to do so, then create the following file, and save it as ~/.xsession, ensuring you run “chmod 700 ~/.xsession”:
#!/bin/sh
exec fvwm-themes-start
If, however, you use GDM or KDM you will have to likely select “failsafe” from their menus which then ought to read ~/.xsession – bit like every thing else from KDE and GNOME they don’t follow “standards”…
– Thomas Adam