Or, if you already know your driver, you can just type in as root:
modprobe <modulename>
Afterwards, you should add
alias sound-slot-0 <modulename>
to your /etc/modules.conf file. C++ above also gave good advice about changing the permissions of your /dev/dsp and /dev/mixer files as you'll run into problems otherwise.
If you run into any problems, ask us and we'll do our best to help.