headlight switch

Trying to replace my bright light dimmer switch but don't know how to take off the cover on the steering wheel please help

My instrument cluster lights are out on my 2004 Century. The 7.5 amp fuse that protects them blows as soon as I turn the headlights on. Well, while investigating this morning, one time the fuse didn't blow for about 10 seconds. In the meantime, a stream of smoke rose from the little vent on the...