If you edit your .fvwm2rc file, simply restart fvwm2 to have the changes implemented. In most environments, there will be a menu item that restarts the window manager. The vanilla setup we started with offers the item Exit fvwm2 on the Root menu. If you select that item, you'll get a submenu titled Really quit fvwm? and several items including Restart fvwm2. When you select Restart fvwm2, your configuration changes should be implemented. A slower but just as effective way is to quit the X session and start it again (presuming your session startup file includes fvwm2).
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