The title says it all

I need to type the following :sudo -s
(password)

cd /system/library/extensions
chmod -R 755 * && chown -R root:wheel *
cd ..
rm extensions.mkext
kextcache -a i386 -e

but when it asks me for the password - I can't type it in,so does anyone know what I'm doing wrong???

The whole thing is for making my audio work,I've infested the forums with threads for witch I apologize,but I'd really like to have a working mac,and without the sound it just doesn't cut it