You insert a loadable module into the kernel with the "modprobe" command.
You cannot edit the kernel directly - you can edit the kernel source!
However - FC does not ship with the kernel source. You must use yum to install it.
To insert a module into the kernel you must recompile the kernel to include your module code. There are plenty of tutorials etc (including in LQ) on compiling the kernel.
Once the module is compiled into the kernel, it is "enabled". (Unless you are thinking of something else?)